Function of Fans:
Pumps move refrigerant; fans move air.
Air is expelled from conditioned space to the outside via exhaust fans.
Air Handling Units (AHUs):
Condition and distribute air within a building.
Large metal boxes connected to ductwork.
May be legally required to have exhaust fans in certain commercial spaces (e.g., hospitals, laboratories, chemical plants).
Location and Function of AHUs:
Installed in floors, rooftops, or basements.
Improve indoor air quality by expelling stuffy, hot, humid, or hazardous air.
Allow fresh outdoor air into the building to maintain slightly positive building pressure for comfort.
Exhaust Fan Applications:
Restrooms: Remove odor and reduce moisture (prevent mold and health risks).
Commercial kitchens: Remove smoke, odor, and moisture.
Office and residential buildings: Standard part of HVAC systems.
Laboratories: Fume hoods with exhaust fans to remove hazardous fumes and maintain negative pressure.
Hospitals: Airborne infection isolation rooms with exhaust fans to create negative pressure.
Industrial settings: Remove chemical pollutants (e.g., ammonia plants) and debris (e.g., sawdust in sawmills).
Indoor pool areas: Remove chemical fumes and moisture.
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