Make Up Air Fans
Return Air Fans (Make-up Air Fans) Return air fans are designed to bring fresh air from the outside back into your building. This fresh air is to 'make-up' for the air that is being sucked away from your building via the exhaust fans. By providing a fresh air balance, your air conditioning will not have to work harder to compensate for the loss of air meaning lower energy bills. Return air and make-up air fans are also installed on a special electrical switch that shut off the flow of air in the event of a fire.