Actronaire & Powered Aire™ Doors

Introduction | FDA / USDA advice | How air doors work
Air Door features | Aire Door models | Make up air fans
Summary | Free consultation | Wind factors | Negative air pressure

How make up air fans work

Make up air fan systems work to counteract the negative air pressure created by exhaust systems and other building conditions.  Many manufacturing processes generate heat as a by-product. Make up air systems can make use of this heat, which is normally wasted, to temper the incoming make-up air.

Make up air system

When the make up air fan is turned on, the damper opens and air is drawn through the shutters and forced into the tube. The tube is inflated and air is discharged out the holes at high velocity. This high velocity causes turbulence, which in turn causes the cool outside air to mix with the stratified heat at the ceilings.

0° F outside air will fill the tube, the high velocity jets will throw and mix with the stratified heat. When the air has moved 4 feet. from the tube, the air temperature will be 70° .

Typical Make Up Air Fan Installations

Introduction | FDA / USDA advice | How air doors work
Air Door features | Aire Door models | Make up air fans
Summary | Free consultation | Wind factors | Negative air pressure