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EXH

EXH / EX – Exhaust, in HVAC system air that is deliberately removed from the building envelope and rejected to the environment is referred to as exhaust air. Building ventilation systems are equipped with exhaust fans that work to draw air out of the buildings from strategic locations where low quality, moist or polluted air is likely to accumulate.

 

A high quality HVAC exhaust system is needed to ensure that air is properly vented to the outdoors.

Is the exhaust from an air conditioner dangerous?

It is not harmful unless you have molds growing inside the unit.