Published at Sunday, 03 February 2019. Kitchen Window and Ventilation Hood. By Osvald Henriksen.
Buy a range hood with a small exhaust fan; for most homes, 150 cfm to 250 cfm is plenty. In a tight house, a stronger exhaust fan can cause problems with backdrafting. Most building codes (for example, Section M1507 of the 2006 IRC) require that kitchen range hoods have a minimum rating of 100 cfm. Broan makes a simple range hood (the 40000 series) rated at 160 cfm; you can find it in stainless steel for only $80 on the Web.
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.
Follow the heating equipment manufacturer’s guideline and safety standards such as those published by the National Fire Protection Association (NFPA), and the American Society for Heating, Refrigeration and Air Conditioning Engineers (ASHRAE), and the local code authorities.
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