Re: [GBlist] kitchen hood cfms

[Norbert Senf <mheat@mha-net.org>]

>(snip)The large, pro-type kitchen ranges popular with the haute boutgeousie
>these days require powerful fans -e.g. 1200 cfm. (snip)

Another question to ask is if the kitchen exhaust fan comes with a 
dedicated makeup air supply. If not, a fan of this size will almost surely 
depressurize the house past - 5 pa, thus making normally vented combustion 
appliances (fireplaces, wood burning stoves, gas and oil furnaces, hot 
water heaters, etc.) spill combustion products into the house.

One alternative to a dedicated, electrically interlocked, makeup air supply 
is to have a variable fan speed control, measure the actual house 
depressurization with a micromanometer, and limit the fan speed to keep the 
house pressure above -5 pa.

Best ....... Norbert



----------------------------------------
Norbert Senf---------- mheat@mha-net.org-nospam
Masonry Stove Builders	(remove -nospam)
RR 5, Shawville------- www.heatkit.com		
Quebec J0X 2Y0-------- fax:-----819.647.6082
---------------------- voice:---819.647.5092
			
		
				



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