我builder 提供的:For hoodfans purchased outside of the design centre, the homeowner acknowledges that the maximum allowed CFMs is 700 and that any future hoodfan must be compatible with the included 6” round duct.
我builder 提供的:For hoodfans purchased outside of the design centre, the homeowner acknowledges that the maximum allowed CFMs is 700 and that any future hoodfan must be compatible with the included 6” round duct.
I called a US company who builds and sells air-makeup-unit and asked their opinion on back draft issue caused by >800cfm range hood. that guy told me if all combustion appliances (e.g. fireplace, hot water tank, furnace etc.) are sealed, there should be no concern on a range hood around 1000cfm in a relatively large house, and it would be an overkill to install a expensive AMU. The air heater in AMU is over 5000kw-10000kw, when that kicks in, your hydro bill will sky rock.