Make-up Air
Make-up air refers to the air that is brought into a space to replace air being exhausted. HVAC systems, especially in commercial and industrial settings, often require make-up air to balance the air pressure within the building. It helps maintain indoor air quality and reduce strain on the HVAC system. Without make-up air, buildings can develop negative pressure, which can lead to backdrafting of combustion gases, reduced HVAC efficiency, and uncomfortable indoor conditions.
💡 Key Takeaways
- ✓Make-up air refers to the air that is brought into a space to replace air being exhausted. HVAC systems, especially in commercial and industrial settings, often require make-up air to balance the air pressure within the building. It helps maintain indoor air quality and reduce strain on the HVAC system. Without make-up air, buildings can develop negative pressure, which can lead to backdrafting of combustion gases, reduced HVAC efficiency, and uncomfortable indoor conditions.
- ✓Make-up air units must be properly sized to match exhaust volumes.
- ✓Quality matters as much as quantity; make-up air should be filtered and conditioned.
- ✓Routine maintenance keeps make-up air units efficient and reliable.
Make-up Air
/ˈmeɪkˌʌp ˈɛər/
Definition
Make-up air refers to the air that is brought into a space to replace air being exhausted. HVAC systems, especially in commercial and industrial settings, often require make-up air to balance the air pressure within the building. It helps maintain indoor air quality and reduce strain on the HVAC system. Without make-up air, buildings can develop negative pressure, which can lead to backdrafting of combustion gases, reduced HVAC efficiency, and uncomfortable indoor conditions.
Why is make-up air important?
It replaces exhausted air to prevent negative pressure and keeps ventilation, comfort, and safety in balance.
Source: The Cooling Company
Quick Facts
How Make-up Air Works
Balanced exhaust and intake keep indoor pressure stable.
Real-World Application
In commercial kitchens, make-up air replaces air exhausted by range hoods to maintain a safe, comfortable workspace. In industrial facilities, make-up air units replace air exhausted by processes, helping control temperature and humidity.
Pro Tip
Regularly check your make-up air unit for proper operation and balance with your HVAC system to support indoor air quality and energy efficiency.
“Regularly check your make-up air unit for proper operation and balance with your HVAC system to support indoor air quality and energy efficiency.”
Important Things to Keep in Mind
- Make-up air units must be properly sized to match exhaust volumes.
- Quality matters as much as quantity; make-up air should be filtered and conditioned.
- Routine maintenance keeps make-up air units efficient and reliable.
Did You Know?
The need for make-up air increases with the size and number of exhaust fans and tighter building envelopes.
FAQ
Do I need a make-up air unit?
If your building has significant exhaust (kitchen hoods, large fans, or process exhaust), a make-up air unit is often required to balance pressure and ventilation.
What happens if make-up air is undersized?
Negative pressure can occur, which reduces exhaust performance and may pull combustion gases back into the building.
Should make-up air be conditioned?
Yes. Conditioning and filtering the incoming air helps maintain comfort and indoor air quality.
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