In the spirit of all things tin-foil, as long as I wear my tin-foil hat, when I am cooking and have my range hood running, I will surely be protected.
Range hood ductwork is required to be SMOOTH WALL metal pipe. While it is in the box, aluminum-foil is pretty smooth but just about as soon as you breathe on it, it becomes wrinkled.
While there are some exceptions (if the ductwork is buried in a concrete slab) generally speaking the range exhaust hood is required to be “galvanized steel, stainless steel or copper.” Note that aluminum of any kind is not listed---let alone aluminum foil.
Improper ductwork can collect grease and become a fire hazard.
Check to make sure the ductwork on your range hood is proper.
Charles Buell, Real Estate Inspections in Seattle
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