Published at Sunday, 03 February 2019. Kitchen Window and Ventilation Hood. By Osvald Henriksen.
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.
Since most residential kitchens are adequately served by a 150-cfm or 250-cfm range hood, it comes as no surprise that a 1,200-cfm range hood can cause depressurization and backdrafting problems. However, the homeowner’s claim that GE had never heard of such problems needed to be verified, so I set out to discover whether GE’s experts are really as clueless as Morris alleged.
General Electric was marketing its 1,200-cfm range hoods to residential customers. In fact, a GE Monogram press release bragged that the appliance could be installed anywhere: “The ventilation system operates at maximum venting capacity of 1,200 cubic feet per minute to keep the kitchen free of fumes and odors. Beautifully finished on all sides, the new Monogram island hood lends elegance to any kitchen.”
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