Published at Sunday, 03 February 2019. Kitchen Window and Ventilation Hood. By Osvald Henriksen.
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.
Venting the polluted air out of your house is always preferable to recirculating it. Recirculating fans use charcoal filters to clean the air and release it back into the house when ducting to the outside is impossible, as in many apartment buildings. When it's the only option, a recirculating hood is better than no ventilation at all, but this type should never be used with pro-style appliances.
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?
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