Published at Thursday, 31 January 2019. Kitchen Window and Ventilation Hood. By Osvald Henriksen.
I got a copy of the GE Monogram installation instructions, and discovered that they were remarkably unhelpful. Astonishingly, the instructions make no mention of the range hood’s requirement for makeup air. The issue was deflected by a confusing reminder that combustion appliances require adequate combustion air: “Sufficient air is needed for proper combustion and exhausting of gases through the flue (chimney) of fuelburning equipment to prevent backdrafting.”
Another consideration is location in the room. Curtains should not be near the stove or too close to splash-back from the sink. Judy Soccio of Couture Window Art says to keep treatments over the sink short—and that includes any cords. Think about how much and what you cook, too: If odors and grease are an issue, Judy says, choose washable fabrics or those with Crypton or Microban.
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.
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