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

Negative air pressure

Exhaust fans may be running in your buildings to remove smoke, fumes, and contaminated air. If you don’t have a make-up air system - or a large enough make-up air system - you have a negative air pressure condition.

Other building conditions such as temperature gradients can cause this phenomenon.

Negative air pressure means that air is drawn into the building to replace the air removed by exhaust systems or other building conditions.

Negative air pressure creates many problems:

• Drafts at the floor level
• Back drafting down furnace stacks
• Cold spots and wind chills in working areas
• Exhaust fans starting to operate inefficiently
• Strong air inrush when a door is opened..

This inrush of air brings with it fumes, insects and the outside climate.  Make up air fans are used to offset negative air pressure.

 

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