你需要查一下local build code

Make-Up Air

Don't underestimate the need for a make-up air system in your HVAC system, especially if you choose a strong hood fan.

High-powered hood fans take out large volumes of air. If this air is not replaced at the same rate that it is expelled, this results in greater air pressure outside the building than inside (a vacuum effect). A make-up air system replaces the air that is expelled by a building's exhaust system, makes sure your exhaust systems work properly and supplies conditioned replacement air that can be heated, cooled, humidified or dehumidified to suit your specific living environment.

Depending on your local building codes, your municipality might insist on the installation of a make-up air device, which would add expense to your construction budget. This is particularly important for renovations, as new builds usually already include a budget for an HVAC system.

所有跟帖： 

• MUA，$$$$$$$$$ -BigXXXX- ♀ (0 bytes) () 06/13/2016 postreply 21:07:29

• 您请看上面。 -星舞原上_211usa- ♀ (0 bytes) () 06/13/2016 postreply 21:17:53

• 回你了上头 -BigXXXX- ♀ (0 bytes) () 06/13/2016 postreply 21:44:22