What is Make-Up Air?

Make-Up Air:

It is simply the outside or fresh air supplied into a building to replace the indoor air. Basically, there are two methods for introducing make-up air into the room i.e. Passive method and Forced air method.

Must Read: What is Air Change in a Room?
Make-up air in Kitchen

They are typically used in industrial or commercial settings (such as Restaurant/Hotel kitchen services, etc). Makeup air units are commonly found in applications where a structure’s interior requires constant 100% outside air and the existing interior air within a room or a building cannot be re-circulated or where the HVAC system does not have the means for introducing fresh or outside air, are good candidates for makeup air units.

Flow of Make-Up Air in to the House

You have to duct properly using at least 6 inch duct, and up to 10 inch in the installations, with the least amount of turns possible. It is way easier to plan for make-up air before construction then installing afterwards.

Why Need Make-Up Air?

Newly energy efficient tight or green homes are well air sealed. So, external air will face more trouble to find a way to replace exhausted air. Also, hood vents will not able to push air out, because there is no air to replace it in your home.

Make-up Air units provide fresh air to the common areas of building like, hallways, lobby, and parking or garage. It acts as a “lungs” of your building. Make up air units also provide comfort cooling and heating to prevent the building from toxic gasses.

General Information About Drawbacks of Make-Up Air:

Make up air into a building through the heated system is the historic method of introducing a make – up air system. It will eliminate some problems caused by the negative pressure but simultaneously it has some drawbacks. Those drawbacks are:

  • Most fire make up air system will increase the amount of wasted heat at the ceiling and will increase the transmitted air and loss through the roof.
  • This system will dump large quantities of air in one area. In many cases, this will leave large portions of the plant without fresh air.
  • Because of the lack of uniform distribution, the result will be a dead air spots.
Also Read:
Importance of Fresh air in Your Home & Life!

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