Published at Tuesday, 29 January 2019. Kitchen Window and Ventilation Hood. By Pedersen Wilda.
ASHRAE’s residential ventilation standard, ASHRAE 62.2, limits exhaust fans to a maximum of 15 cfm per 100 square feet of occupiable space, unless a backdrafting test is performed. According to this standard, the smallest home in which a 1,200-cfm range hood could be installed without verifying makeup air needs would be one measuring 8,000 square feet — a very large McMansion indeed.
Range hoods have at least one thing in common with combustion appliances: they also require makeup air, although the GE instructions fail to note that fact. So why do the instructions refer to the need for providing makeup air for furnaces and water heaters — but fail to inform installers that range-hood fans also need a source of makeup air?
If you’re comfortable with metal working, cover up your old range hood vent using sheets of galvanized metal—the same material used to install flashing along a chimney. Your home center will have sheets or rolls of metal, as well as specialty tin snips for cutting. (If you need help check out these tips for cutting sheet metal.) If you’re looking for something with more of an antique flare, consider buying custom metal finishes to match your style.
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