Published at Thursday, 31 January 2019. Kitchen Window and Ventilation Hood. By Osvald Henriksen.
GE went out of its way to advise range-hood installers of the best way to install a water heater or a furnace — that is, by following ASHRAE standards. Why didn’t GE bother to tell range-hood installers that ASHRAE also has something to say about the best way to install a range hood?
Some Passivhaus builders are experimenting with range-hood fans that don’t exhaust air to the exterior. Instead, they pull air from above the stove and pass it through a charcoal filter before returning the air to the kitchen. On the ceiling of the kitchen, in a location as far from the stove as possible, they also install a grille connected to the exhaust system of the home’s HRV.
As a stop-gap measure, a homeowner with backdrafting problems can open a window near the kitchen every time the range-hood fan is turned on. Although this solution works, it won’t satisfy most homeowners, and builders who suggest this remedy may still be legally liable for future backdrafting problems.
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