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That's funny, Lomanco shows a painted aluminum vent and a painted galvanized vent with two different model numbers.aluminum is a metal, fwiw.
If you pick up an aluminum vent then a galvanized vent of the same size and brand the galvanized vent will weigh more. If the weight is to close to determine a magnet will tell you which is which, fwiw.
The simple point I was trying to make was although both may let out air at the same rate the ALUMINUM vent will show more hail damage than the GALVANIZED vent.