Published at Tuesday, 15 January 2019. Kitchen Window and Ventilation Hood. By Ulf Madsen.
If you've ever forgotten to turn on the fan while trying to get a nice crust on a pan full of fish fillets, you're familiar with the importance of good ventilation. In addition to whisking away unwanted odors, vent hoods remove moisture and grease, as well as carbon monoxide, nitrogen dioxide, and other pollutants that cooking can release into the air.
Moreover, in a house with an atmospherically vented water heater, a 1,200-cfm GE Monogram range hood may cause backdrafting of flue gases, even if the water heater was originally installed in compliance with NFPA and ASHRAE standards. So complying with these standards for water-heater installation won’t keep you out of trouble.
Broan recommends installing an outdoor air duct connected to a grille mounted on the kitchen wall or connected directly to the return plenum of your furnace; the motorized damper is installed in the duct. One 8-inch-diameter duct works for a range hood rated up to 1,000 cfm. If your range hood is bigger than that, you’ll need two ducts.
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