Published at Tuesday, 15 January 2019. Kitchen Window and Ventilation Hood. By Ulf Madsen.
Here’s the new IRC provision, which is found in section M1503.4: “Exhaust hood systems capable of exhausting in excess of 400 cfm shall be provided with makeup air at a rate approximately equal to the exhaust air rate. Such makeup air systems shall be equipped with a means of closure and shall be automatically controlled to start and operate simultaneously with the exhaust system.
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.
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.”
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