Ventilation System Design for Pig Farrowing Rooms

By Dr. Zubair Khalid, DVM, MS, PhD · 2026-08-14

Key Takeaways

Dual Thermal Zones are Critical: Farrowing rooms require distinct temperature zones: 60-65°F for the sow to maintain feed intake and milk production, and 90-95°F for newborn piglets, gradually decreasing to 85°F by weaning, necessitating a separate, localized heat source (e.g., heat lamp, mat) for piglets as the ventilation system alone cannot satisfy both needs without compromising the sow.
Minimum Ventilation is Non-Negotiable: A continuous minimum ventilation rate of 10-20 CFM per sow is essential year-round to effectively remove moisture, ammonia, and carbon dioxide, preventing respiratory issues and maintaining air quality, even in cold weather when heat preservation is a priority.
Mechanical Ventilation with Staged Control is Optimal: Mechanical ventilation systems with multiple, staged fan controls (3-5 stages) are superior for farrowing rooms, allowing precise airflow adjustments from 10-20 CFM/sow (minimum) to 800-1000 CFM/sow (maximum summer cooling), thereby managing temperature fluctuations and preventing drafts more effectively than single-speed fans or natural ventilation.
Air Inlet Design and Maintenance are Paramount: Properly sized and placed air inlets, directing air across the ceiling to mix and temper before descending, are crucial for achieving the desired temperature gradient; regular cleaning of fans, shutters, and inlets (monthly) is vital, as dust buildup can reduce fan performance by up to 30%.
Static Pressure Monitoring is a Key Diagnostic: Maintaining a static pressure between 0.05 to 0.10 inches of water column in mechanically ventilated rooms is critical for ensuring air moves through the designed inlets at the correct velocity; daily checks and adjustments to inlets are necessary to prevent inadequate air exchange or excessive drafts.
Comprehensive Monitoring and Recordkeeping are Essential: Daily checks of temperature, humidity, fan stage, static pressure, and piglet/sow behavior, alongside weekly and monthly system inspections, are vital for early detection of ventilation failures; detailed recordkeeping of these parameters and piglet outcomes (mortality, weaning weights) allows for trend analysis and proactive problem-solving.

Getting ventilation right in a farrowing room is one of the most challenging jobs in pig production. The room must serve two very different animals at once. The sow needs cool air, ideally between 60 and 65 degrees Fahrenheit, to maintain feed intake and milk production. Her newborn piglets need warmth, around 90 to 95 degrees Fahrenheit in the first days of life, because they cannot regulate their own body temperature until they are several days old. A single room that fails to meet both needs will cost you in piglet mortality, slow weaning weights, and poor sow condition.

This guide covers the full scope of farrowing room ventilation design, including how to calculate air exchange rates, choose between natural and mechanical systems, set up inlets and exhaust fans, manage seasonal temperature swings, and monitor the system once it is running. It is written for farm owners, herd managers, and employees who install, operate, or troubleshoot ventilation in farrowing facilities. The principles apply to both retrofitting an existing barn and planning new construction.

At a Glance

Zone the room by temperature. The sow zone should target 60 to 65 degrees Fahrenheit. The piglet zone needs 90 to 95 degrees Fahrenheit for newborns, dropping to about 85 degrees by weaning.
Provide a separate heat source for piglets. A creep area with a heat lamp, heat mat, or hover board is not optional. The ventilation system alone cannot keep piglets warm without cooking the sow.
Minimum ventilation runs year-round. Even in winter, the room needs 10 to 20 cubic feet per minute per sow to remove moisture, ammonia, and carbon dioxide.
Maximum ventilation in summer depends on room size. Plan for 800 to 1,000 cubic feet per minute per sow in hot weather, using tunnel or cross-flow designs with high-velocity air movement.
Use a controller with staged fans. A simple thermostat running one fan at full speed creates drafts and temperature swings. Step-controlled fans or variable-speed drives keep the room stable.
Check static pressure daily. Most mechanically ventilated farrowing rooms operate best at 0.05 to 0.10 inches of water column. If pressure drifts, air stops moving through the designed inlets.
Clean fans, shutters, and inlets monthly. Dust buildup can cut fan performance by 30 percent or more without any change in the controller settings.
Keep records. Log temperature, humidity, fan stage, static pressure, and piglet mortality weekly. Trends tell you when the system is failing before the pigs show it.

Why Farrowing Rooms Need Special Ventilation Design

Farrowing rooms are not like grow-finish barns. The animals in the room have opposite thermal needs, and the room cycles through a dramatic population change every few weeks. A typical farrowing room holds 10 to 30 crates, and each crate is emptied, cleaned, and repopulated on an all-in all-out schedule. The ventilation system must handle an empty room, a room of heavily pregnant sows, a room of sows with newborns, and a room of sows with pigs approaching weaning weight. Each phase demands different airflow.

The central problem is the temperature conflict between sow and piglet. A lactating sow produces a large amount of body heat. Her comfort zone sits around 60 to 65 degrees Fahrenheit. When the room temperature rises above that range, she reduces feed intake, which directly cuts milk production. Research from swine extension programs consistently shows that sows exposed to heat stress eat less and wean lighter pigs. On the other end, newborn piglets are born with almost no body fat and a high surface-area-to-body-weight ratio. They cannot shiver effectively for the first day or two, and their internal temperature drops quickly if they do not have a warm microclimate. A piglet that gets chilled soon after birth is more likely to be crushed by the sow because it stays close to her for warmth, and it is more likely to scour or develop other health problems.

The ventilation system is the tool that resolves this conflict. It moves the sow's excess heat out of the room while a localized heat source keeps the piglet zone warm. In cold weather, the system runs at minimum rates to preserve heat while still removing moisture and gases. In warm weather, the system runs at maximum rates to keep the sow cool, and the piglets rely on their creep area for warmth. The design of inlets, fans, and controls determines whether the air goes where it is needed.

Another reason farrowing rooms need careful design is the gas load. Pig manure produces ammonia, hydrogen sulfide, and carbon dioxide. High ammonia levels irritate the respiratory tracts of both sows and piglets, making them more susceptible to pneumonia and other diseases. Carbon dioxide accumulates when ventilation is too low, which can make pigs lethargic and reduce feed intake. Moisture is also a major concern. A lactating sow and her nursing piglets produce a lot of water vapor. If the ventilation rate is too low, condensation forms on walls and ceilings, which promotes bacterial and fungal growth and makes the environment feel damp and cold even when the air temperature reads acceptable.

Understanding the Thermal Needs of Sows and Piglets

Before you design or adjust a ventilation system, you need a clear picture of the animals' temperature requirements at each stage of the farrowing cycle.

The Sow's Comfort Range

The lactating sow has a thermoneutral zone, the temperature range where she does not have to expend extra energy to stay warm or cool off, of roughly 60 to 70 degrees Fahrenheit. The lower end of that range is better for feed intake. Many commercial operations target 60 to 65 degrees Fahrenheit in the sow zone during lactation. At temperatures above 75 degrees, sows begin to show visible signs of heat stress: panting, increased respiration rate, reduced feed intake, and restlessness. A panting sow is less likely to lie still for nursing, which increases the risk of crushing piglets.

The sow's heat production rises as lactation progresses because she is producing more milk. A sow in peak lactation can produce 10 to 12 liters of milk per day, and that metabolic work generates substantial body heat. The ventilation system must be able to handle this increasing heat load over the three to four week lactation period.

The Piglet's Needs

Newborn piglets need a microenvironment at 90 to 95 degrees Fahrenheit for the first few days of life. The sow's body temperature is about 102 degrees, so a piglet lying against the sow stays warm, but the moment it moves away to the bare floor, it loses heat rapidly. Concrete floors are especially problematic because they conduct heat away from the piglet's body. A piglet on a cold concrete floor can lose body heat faster than it can produce it.

The piglet's temperature requirement drops gradually as it grows. By day 7, the creep area can be around 88 degrees. By day 14, about 85 degrees. By weaning at three to four weeks, the piglets can tolerate temperatures in the mid-70s if they are healthy and eating creep feed. The ventilation system does not directly control the creep area temperature. That is the job of the heat lamp, heat mat, or hover. But the ventilation system must move air without creating drafts that chill the creep area.

The Temperature Gradient

A well-designed farrowing room has a measurable temperature gradient from the floor to the ceiling and from the sow zone to the piglet zone. The floor-level temperature where piglets live should be warmer than the air at the sow's head level. This is the opposite of what happens in a poorly ventilated room, where warm air rises and collects at the ceiling while the floor stays cold. Proper inlet placement and air mixing create the right gradient.

Ventilation System Types for Farrowing Rooms

There are two basic approaches to ventilating a farrowing room: natural and mechanical. Most modern farrowing facilities use mechanical ventilation because it gives precise control over airflow regardless of outside weather. Natural ventilation depends on wind and temperature differences, which are hard to control in a room that needs such specific conditions.

Natural Ventilation

Natural ventilation uses ridge openings, side wall curtains, or large doors to let air move through the building. It works well in mild climates and in buildings where the animals are less sensitive to temperature swings. For farrowing rooms, natural ventilation has serious limitations. It cannot provide consistent minimum ventilation in cold weather without chilling the piglets. It cannot remove moisture and gases reliably when there is no wind. It gives you little control over the temperature gradient between the sow and the piglet zone. Some farms use natural ventilation for summer air movement in combination with a mechanical minimum ventilation system for winter. This hybrid approach can work, but it requires careful management and a controller that can integrate both systems.

Mechanical Ventilation

Mechanical ventilation uses fans to move air through the building. There are three main configurations: exhaust, pressurization, and tunnel.

Exhaust ventilation is the most common system for farrowing rooms. Fans mounted in the walls or ceiling pull air out of the room, creating a slight negative pressure. Fresh air enters through controlled inlets in the opposite wall or ceiling. The negative pressure, measured as static pressure, determines how fast air enters through the inlets. This system gives good control over air distribution if the inlets are sized and positioned correctly.

Pressurized ventilation pushes air into the room with fans, creating positive pressure. Air leaves through openings in the walls or ceiling. This system is less common in farrowing rooms because it is harder to control where the air goes. It can be useful in rooms that need extra filtration or where the building layout makes exhaust ventilation impractical.

Tunnel ventilation is a high-airflow system used for summer cooling. Large fans at one end of the room pull air through the building at high velocity, creating a wind-chill effect that cools the sows. In a farrowing room, tunnel ventilation is usually a supplementary system added to the minimum ventilation system. The tunnel fans run only when the room temperature exceeds a set point, typically around 75 to 80 degrees.

Choosing a System

For most commercial farrowing operations, the best choice is a mechanically ventilated room with a minimum ventilation system for cold weather and a tunnel or high-volume system for warm weather. The minimum ventilation system runs continuously, even in winter, to control moisture and gases. The high-volume system kicks in as the outside temperature rises. A controller manages the transition between stages.

Calculating Ventilation Requirements

Ventilation requirements are expressed in cubic feet per minute (CFM) per sow or per pig. These numbers are the foundation of your system design. If you undersize the fans, the room will not cool adequately in summer. If you oversize them, you will have trouble maintaining minimum airflow in winter without creating drafts.

Minimum Ventilation Rate

The minimum ventilation rate is the amount of airflow needed in cold weather to remove moisture, ammonia, carbon dioxide, and other gases while preserving heat. For farrowing rooms, the minimum rate is generally 10 to 20 CFM per sow. This rate varies with outside temperature and the number of pigs in the room. A room at 20 degrees outside needs less minimum airflow than a room at 50 degrees because cold air holds less moisture and the temperature difference drives more natural air exchange through cracks and openings.

A common starting point is 15 CFM per sow for the minimum stage. A room with 20 crates therefore needs a minimum airflow of 300 CFM. That is a relatively small fan, typically 12 to 18 inches in diameter, running at low speed. The controller cycles this fan on and off to maintain the target temperature and humidity.

Maximum Ventilation Rate

The maximum ventilation rate is the airflow needed to keep the room cool on the hottest days. For farrowing rooms, the summer maximum is typically 800 to 1,000 CFM per sow. A 20-crate room needs 16,000 to 20,000 CFM of total fan capacity for summer. This is a substantial amount of air movement, and it requires large fans, typically 24 to 48 inches in diameter, mounted in the tunnel end or side walls.

The maximum rate depends on your climate. A farm in a hot southern region needs more airflow than a farm in a cool northern region. Local extension engineers can provide specific recommendations for your area. As a general rule, plan for at least 800 CFM per sow if summer temperatures regularly exceed 85 degrees.

Matching Fan Stages to the Heat Load

The ventilation system should have multiple stages so it can match airflow to the changing needs of the room. A typical farrowing room has three to five stages:

Stage 1: Minimum ventilation, one small fan running continuously or cycling. Provides 10 to 20 CFM per sow.
Stage 2: Additional exhaust fans come on as the room temperature rises. Provides 30 to 50 CFM per sow.
Stage 3: More fans come on for mild weather. Provides 100 to 200 CFM per sow.
Stage 4: High-volume fans for warm weather. Provides 400 to 600 CFM per sow.
Stage 5: Tunnel fans or maximum exhaust for hot weather. Provides 800 to 1,000 CFM per sow.

The controller turns each stage on and off based on room temperature sensors. The goal is to maintain the sow zone temperature within a narrow range, usually plus or minus 2 degrees from the set point.

Designing the Air Inlet System

The air inlets are just as important as the fans. Air must enter the room through controlled openings that direct it where you want it to go. In a farrowing room, you want fresh air to enter high in the room, mix with the warm air at the ceiling, and then fall gently into the animal zone. This prevents cold drafts at floor level while still providing good air exchange.

Inlet Types

Ceiling inlets are the most common type in mechanically ventilated farrowing rooms. These are adjustable openings in the ceiling that direct air along the ceiling surface. The air travels across the ceiling, picking up heat, before it drops into the room. Ceiling inlets work well with negative-pressure exhaust systems because the static pressure pulls air through them at a controlled velocity.

Side wall inlets are mounted in the walls, usually above the crates. They direct air upward and across the ceiling. Side wall inlets are easier to install in retrofit situations where the ceiling is not accessible.

Eave inlets bring air in from the attic or eave space. They work well in rooms with an attic that can pre-temper the air in winter. The air passes through the attic, picks up some heat, and enters the room through slots along the eaves.

Sizing the Inlets

The total inlet area must match the fan capacity. A common rule of thumb is that the inlet area should provide about 1 square foot of opening for every 700 to 900 CFM of fan capacity at a static pressure of 0.05 to 0.10 inches of water column. If the inlets are too small, the static pressure rises and the fans move less air. If the inlets are too large, the air velocity drops and the air does not mix properly at the ceiling.

The inlet openings must be adjustable. In winter, you want small openings with high air velocity to throw the air across the ceiling. In summer, you want larger openings to allow higher total airflow. Many modern controllers operate motorized inlets automatically, adjusting the opening size based on static pressure.

Inlet Placement

Place inlets so that air travels across the room and exhausts on the opposite side. This creates a sweep of air that removes gases and moisture from the animal zone. Avoid placing inlets directly above the creep areas where cold air could drop onto piglets. If you must place an inlet near a creep, install a baffle to direct the air away.

Fan Selection and Placement

Fans are the workhorses of the ventilation system. Choose fans that are rated for agricultural use, with sealed motors and corrosion-resistant housings. The fan performance is measured by the amount of air it moves at a given static pressure. A fan that moves 10,000 CFM at zero static pressure might only move 7,000 CFM at 0.10 inches of water column. Always size fans based on their performance at the operating static pressure, not at free air.

Minimum Ventilation Fans

The minimum ventilation fan should be small enough to provide the low airflow needed in winter without creating excessive drafts. A 12 to 18 inch fan with a variable-speed drive can run at low speed in winter and higher speed as the weather warms. The fan should be located in the wall opposite the inlets, ideally at the same height as the animal zone or slightly above.

Intermediate Fans

The intermediate stages use fans in the 18 to 24 inch range. These come on as the room temperature rises above the minimum set point. They provide the airflow needed for spring and fall conditions.

Tunnel Fans

The tunnel fans are large units, 36 to 48 inches, mounted at one end of the room. They pull air down the length of the building at high velocity. The air inlets for tunnel ventilation are large openings at the opposite end of the room. Tunnel ventilation creates a wind-chill effect that can lower the effective temperature at the sow level by several degrees.

Fan Maintenance

Fans lose performance as dust builds up on the blades, shutters, and guards. A fan that is 30 percent blocked by dust moves 30 percent less air. Clean the fans monthly during periods of heavy use. Check the belts on belt-driven fans and replace them when they show signs of wear. Verify that the shutters open fully when the fan runs and close tightly when it stops. A shutter that sticks open allows cold air to leak into the room in winter.

Controlling the System

The controller is the brain of the ventilation system. It reads temperature and humidity sensors, compares the readings to the set points, and turns fans and heaters on and off. A good controller makes the system work automatically, but it still needs regular attention from the farm manager.

Temperature Sensors

Place temperature sensors at the sow level, about 24 to 30 inches above the floor, in the center of the room. Do not place sensors near heat lamps, in direct sunlight, or near the air inlets where they will read the incoming air temperature instead of the room temperature. Use multiple sensors and average the readings to avoid a single faulty sensor causing a system failure.

Set Points

The room temperature set point depends on the stage of lactation and the outside weather. Many farms use a single set point around 70 degrees for the sow zone, with the understanding that the piglets have their own heat source. In winter, the set point might be 68 to 70 degrees. In summer, you might raise the set point to 75 to 78 degrees because the fans are already running at maximum and you do not want them cycling on and off rapidly.

Humidity Control

Relative humidity in a farrowing room should stay between 50 and 70 percent. High humidity promotes disease and makes the room feel cold. Low humidity can cause dust problems and respiratory irritation. If the humidity is consistently above 70 percent in winter, increase the minimum ventilation rate. The controller may have a humidity sensor that overrides the temperature set point to increase airflow when humidity gets too high.

Static Pressure Control

The static pressure is the difference in air pressure between the inside and outside of the room. It is measured in inches of water column. A negative-pressure exhaust system needs a static pressure of 0.05 to 0.10 inches to pull air through the inlets at the correct velocity. If the static pressure is too low, the air enters the room slowly and falls directly to the floor, causing drafts. If it is too high, the fans move less air and the room becomes stuffy.

The controller should adjust the inlet openings to maintain a consistent static pressure. Some controllers use a static pressure sensor that automatically opens or closes the inlets. Others require manual adjustment. Check the static pressure daily and adjust the inlets whenever you change the fan stages.

Heating and Supplemental Heat

The ventilation system moves air, but it does not generate heat. In cold weather, you need a heating system to keep the room at the target temperature. There are two types of heat to consider: room heat and creep heat.

Room Heat

The room heating system raises the overall temperature of the air in the farrowing room. This is usually a forced-air furnace or radiant heaters mounted in the ceiling or walls. The room heater runs when the ventilation fans would otherwise pull the temperature below the set point. In a well-insulated room, the sows' own body heat provides a significant portion of the heat needed. A room full of lactating sows can keep itself warm even in freezing weather if the ventilation rate is kept at minimum.

The room heater should be sized to handle the coldest expected conditions. A common rule of thumb is to provide 1,500 to 2,000 BTU per hour per sow for the room heating system. A 20-crate room needs 30,000 to 40,000 BTU per hour. This is a relatively small heater compared to what you would need for a grow-finish barn.

Creep Heat

The creep area is a zone within the crate where the piglets can get away from the sow. It is typically a corner of the crate with a heat lamp, a heat mat, or a hover cover. The creep heat source provides the localized warmth that newborn piglets need.

Heat lamps are the most common creep heat source. A 125 to 250 watt infrared heat lamp suspended above the creep area can provide the 90 to 95 degrees needed by newborns. Hang the lamp at the correct height to achieve the target temperature at piglet back height. Check the temperature under the lamp with a thermometer placed on the floor of the creep area.

Heat mats are electric pads that lie on the floor of the creep area. They provide heat from below, which is more natural for piglets because they lose heat through the floor. Heat mats are more energy efficient than heat lamps because they heat only the floor surface, not the surrounding air.

Hover boards are solid covers over the creep area that trap the heat from a lamp or mat. They create a small, warm microclimate that is especially effective in cold rooms. The hover should be adjustable in height so you can raise it as the piglets grow and need less heat.

Managing the Creep Temperature

Adjust the creep heat as the piglets age. Newborns need 90 to 95 degrees. Reduce the temperature by about 2 degrees per week as the piglets grow. You can adjust the heat lamp height or change the thermostat on a heat mat. Watch the piglets' behavior. If they pile up on top of each other, they are cold and the heat should be increased. If they spread out away from the heat source, they are too warm.

Seasonal Ventilation Management

The ventilation system must be adjusted as the seasons change. A system that works well in October will not work in January or July. The farm manager needs a seasonal plan for changing set points, inlet openings, and fan stages.

Winter Management

In winter, the goal is to remove moisture and gases while preserving heat. The minimum ventilation fan runs continuously, cycling on and off to maintain the set point. The room heater runs as needed. The inlets should be set to a small opening so the incoming air moves at high velocity across the ceiling and mixes with the warm room air before falling to the floor.

Watch for condensation on the windows, walls, and ceiling. Condensation means the ventilation rate is too low to remove the moisture produced by the sows and piglets. Increase the minimum ventilation rate slightly. Also check the insulation. Poor insulation causes cold surfaces that condense moisture even when the ventilation is adequate.

Spring and Fall Management

The shoulder seasons are the most difficult because the weather changes rapidly. A warm day may require the intermediate fans to run, while a cold night may drop back to minimum ventilation. The controller handles these transitions automatically, but you need to check the system regularly to ensure the inlets are opening and closing properly.

During the shoulder seasons, the temperature difference between day and night can be 30 degrees or more. The controller must be able to respond quickly. Make sure the temperature sensors are clean and functioning. Check that the inlet motors are moving freely and not sticking.

Summer Management

In summer, the goal is to keep the sows cool. The tunnel fans run at maximum capacity during the hottest part of the day. The inlets are fully open to allow maximum airflow. The room temperature may rise to 80 degrees or more, but the high air velocity provides a wind-chill effect that helps the sows dissipate heat.

In extreme heat, additional measures may be needed. Drip cooling systems spray small amounts of water onto the sow's neck and shoulders, which evaporates and cools her. Snout coolers direct air at the sow's face. These systems are not part of the basic ventilation design, but they can be valuable additions in hot climates.

Common Ventilation Mistakes

Many farrowing room problems trace back to ventilation mistakes that are easy to make and easy to miss. Here are the most common ones.

Undersized Minimum Ventilation

Some farms try to save money by installing only summer fans and relying on natural leakage for winter ventilation. This never works. The room becomes damp, ammonia levels rise, and piglets develop respiratory problems. Even in the coldest weather, you need a dedicated minimum ventilation fan that runs continuously or cycles frequently.

Oversized Minimum Ventilation

The opposite problem is installing a minimum ventilation fan that is too large. A large fan running at minimum speed still moves too much air in winter, pulling heat out of the room and creating drafts at floor level. The room temperature swings widely as the fan cycles on and off. The solution is to use a smaller fan or a variable-speed drive that can run the fan at very low speed.

Poor Inlet Distribution

If the inlets are not distributed evenly around the room, some areas get too much air and others get none. The air takes the path of least resistance, so areas near the fans get good airflow while the far corners become stagnant. Measure the air movement in different parts of the room with a smoke pencil or anemometer to identify dead zones.

Ignoring Static Pressure

Farmers who do not check static pressure often have rooms where the inlets are wide open and the fans are running, but the air is not moving properly. The static pressure is too low, so the air enters slowly and falls to the floor near the inlets. The result is drafts on the piglets and poor air mixing. Check the static pressure gauge daily and adjust the inlets.

Not Cleaning the System

Dust and cobwebs accumulate on fan blades, shutters, inlets, and sensors. A dust-covered sensor reads the temperature of the dust, not the room air. A dust-covered fan moves significantly less air. Make a cleaning schedule and stick to it.

Setting the Temperature for the Wrong Animal

Some farmers set the room thermostat to 85 degrees to keep the piglets warm. This overheats the sow, reduces her feed intake, and increases the risk of crushing. The room temperature should be set for the sow. The piglets get their warmth from the creep heat source, not from the room air.

Monitoring and Recordkeeping

A ventilation system is only as good as the monitoring that supports it. You cannot manage what you do not measure. Establish a routine for checking the system and recording the results.

Daily Checks

Every day, walk through the farrowing room and check the following:

Room temperature at sow level in several locations
Temperature under the heat lamps in the creep areas
Relative humidity
Static pressure reading
Which fan stages are running
Condition of the piglets, especially whether they are piling or spreading
Condition of the sows, especially whether they are panting
Any condensation on walls, windows, or ceilings
Any unusual odors, especially ammonia

Record these observations in a logbook or on a spreadsheet. The daily log gives you a baseline for detecting problems before they become serious.

Weekly Checks

Once a week, perform a more thorough inspection:

Clean the temperature sensors and check their accuracy against a known thermometer
Check the fan belts and tighten or replace as needed
Clean the fan blades and shutters
Verify that the inlet motors are opening and closing fully
Check the heater for proper operation
Look for air leaks around doors, windows, and fan openings

Monthly Checks

Once a month, test the emergency systems:

Verify that the alarm system works by temporarily triggering it
Check the backup generator and fuel supply
Test the high-temperature alarm
Review the ventilation controller settings and adjust for the upcoming season

Recordkeeping

Keep records of the following for each farrowing group:

Average room temperature during the lactation period
Number of piglets born alive and dead
Number of piglets weaned and average weaning weight
Any health problems, especially scours or respiratory disease
Ventilation system adjustments and maintenance performed

These records help you identify trends. If piglet mortality rises in the summer, check the ventilation records to see if the room temperature was running above target. If weaning weights drop in the winter, check whether the minimum ventilation was too high and pulling heat out of the room.

When to Call a Veterinarian or Extension Agent

Most ventilation problems show up as pig health problems before they show up as equipment failures. If you see any of the following signs, investigate the ventilation system and consider calling for professional help:

Piglets are piling in the creep area despite the heat source being on
Sows are panting heavily even when the room temperature seems acceptable
Piglets have a high rate of scours that does not respond to treatment
Weaning weights are consistently below target
Ammonia levels are high enough to make your eyes water when you enter the room
Condensation is heavy on walls and ceilings
Pigs are coughing or showing signs of respiratory distress

Your veterinarian can help you determine whether the health problems are caused by infectious disease, ventilation problems, or a combination of both. An extension agricultural engineer can evaluate your ventilation system, measure air exchange rates, and recommend specific improvements.

Do not wait until the problem is severe. A ventilation problem that goes unnoticed for a week can cost you an entire group of piglets. If you are unsure whether the ventilation is adequate, get a professional opinion early.

Frequently Asked Questions

What temperature should a farrowing room be?

The room temperature should be set for the sow, not the piglets. Target 60 to 65 degrees Fahrenheit at the sow level for the first week of lactation, rising slightly to 65 to 70 degrees as the piglets grow. The piglets need 90 to 95 degrees in their creep area, which is provided by a heat lamp, heat mat, or hover. If the room is warm enough for the piglets, it is too warm for the sow.

How much ventilation does a farrowing room need?

The minimum ventilation rate is 10 to 20 CFM per sow for cold weather. This removes moisture and gases while preserving heat. The maximum ventilation rate is 800 to 1,000 CFM per sow for hot weather. Most rooms have multiple fan stages between these extremes so the controller can match airflow to the current conditions.

Why are my piglets piling up even though the heat lamp is on?

Piling is a sign that the piglets are cold. The heat lamp may be too high, the bulb may be too small, or the draft from the ventilation system may be blowing the heat away. Check the temperature at the floor of the creep area with a thermometer. It should be 90 to 95 degrees for newborns. If the temperature is correct but the piglets still pile, look for drafts. Cold air falling from the inlets can chill the creep area even when the air temperature reads acceptable.

Should I use a heat lamp or a heat mat for piglets?

Both work well, and many farms use a combination. Heat lamps provide radiant heat from above and are easy to adjust by raising or lowering the lamp. Heat mats provide heat from below, which is more natural because piglets lose heat through the floor. Heat mats are more energy efficient but cost more to install. The best choice depends on your budget, your floor type, and your management style. Some farmers prefer heat lamps because they can see the light and know the heat is on.

How do I know if my ventilation system is working properly?

Watch the pigs. Healthy piglets are spread out in the creep area, not piled up. Sows are lying quietly and not panting. The air smells fresh, not ammonia-heavy. The walls are dry with no condensation. The static pressure reads within the target range of 0.05 to 0.10 inches. If you see any of these signs going wrong, check the system components and make adjustments.

How often should I clean the fans in my farrowing room?

Clean the fans at least monthly during periods of heavy use. In dusty conditions or during summer when the fans run continuously, clean them every two weeks. Dust buildup on the fan blades can reduce airflow by 30 percent or more. Use a brush or compressed air to remove dust from the blades, shutters, and guards. Also clean the temperature sensors and the static pressure sensor ports.

What should I do if the power goes out in my farrowing room?

Every farrowing room needs a backup power source, either a generator or a battery-powered alarm system. The alarm should alert you immediately when the power fails. In winter, the room will cool quickly without ventilation and heat. In summer, the room will overheat quickly without ventilation. Have a plan for responding to power failures, including a generator that is tested monthly and a fuel supply that is kept full.

When should I call an extension agent about my ventilation system?

Call an extension agent or agricultural engineer if you have tried adjusting the system and still see problems. Signs that you need professional help include persistent high ammonia levels, heavy condensation, piglet health problems that do not respond to treatment, or a room that cannot maintain the target temperature despite the system running at full capacity. An engineer can measure the actual airflow, check the static pressure, and recommend specific changes to the fan capacity, inlet sizing, or controller settings.

Related Farming Guides

This section will be populated with links to other farming guides on this site. Check back for related content on pig barn design, swine health management, and environmental control for livestock buildings.

Related Clinical & Scientific Guides

References

USDA Farm Management: https://www.farmers.gov/
FAO Farm Management: https://www.fao.org/farmer-field-schools/en/
FAO Animal Production and Health: https://www.fao.org/animal-production/en/
WOAH (World Organisation for Animal Health): https://www.woah.org/en/home/

This article is educational and is not a substitute for veterinary diagnosis, treatment, public-health guidance, or regulatory reporting.