Garage Exhaust
Garage Exhaust
(OP)
Situation: Single exhaust fan cannot get another. Two areas to vent, a small garage/workshop and a chemical storage area. The National Building Code states that garage has to have dedicated exhaust. I want to install a damper system that makes the fan vent the garage during the day when it is in use and vent the chemical room during the night when it is a problem. Is this permitted?





RE: Garage Exhaust
HVAC68
RE: Garage Exhaust
Regards,
RE: Garage Exhaust
You'll of course have to check that the fan is capable of providing the minimum amount of exhaust required at the most demanding space. If it's a constant speed fan, the area that's farther away will have a presumably larger static pressure drop in it's duct system, so the airflow for the "closer" space may be greater than that of the "farther space, unless you compensate with volume dampers or duct sizing methods.
RE: Garage Exhaust
I beleive that term "dedicated" really means separate.
Both systems, garge vent and chemical storage have it's own safety concerns which are not compactible. In addition, how do you plan to vent chemicals when garage is in use?
For me, it is clear situation: use separate systemss. I know it costs more, but safety is not place to put your saving efforts on.