Published at Sunday, 03 February 2019. Kitchen Window and Ventilation Hood. By Osvald Henriksen.
So where does a powerful range-hood fan get its makeup air? If the house doesn’t have enough random air leaks around windows, doors, and mudsills, the makeup air is often pulled backwards through water-heater flues or down wood-burning chimneys — a phenomenon called backdrafting. Since the flue gases of some combustion appliances can include carbon monoxide, backdrafting is dangerous. In some cases, it can be life-threatening.
Kitchen windows present a few challenges. The windows all may not match; maybe there are casements over the sink, large double-hungs in the eating area, and a glass door to the mudroom. Go with what’s practical in each case, tying the treatments together with material or color, or a common trim or stencil. Ann Wallace of Prairie Textiles suggests bottom-only café curtains over the sink, for example, with full-length curtains in the eating area, and a panel (held by rods at the top and bottom) for the window in the door.
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.
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