Published at Sunday, 03 February 2019. Kitchen Window and Ventilation Hood. By Osvald Henriksen.
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.
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.
Armed with the limited recommendations provided by GE’s installation instructions, I sought more information by placing two calls to the GE Answer Center (800-626-2000), asking, “Does GE have any recommendations on providing makeup air for a 1,200-cfm GE range hood installed in a residential kitchen?” The first GE expert responded, “What is makeup air?” An explanation was provided. She responded, “Do you mean you want to know the cfm of the fan?” After further discussion, I was put on hold. A few minutes later, the expert returned to the phone to report, “That information is not something we would have here.”
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