.....I have used them in residential construction.....they collect moisture/condinsation so the sides have to be insulated to R- 15 and sealed with enamel paint 3 coats.....I have retroed t hem to move the moisture and stale air with a pancake fan.....that does work somewhat except in bathrooms and then nothing works really well.....I only install them after advising the owner against it...with NO warranty using the factory instructions......best of luck....I've busted my azz personally trying to get them to perform as advertized with little or no luck......good luck to you....geofkaye
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women-food-money-naps...not necessarly in that order
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