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here's my almost done duct remodel...still have to paint the screws white... but I did find this, the ceiling is some sort of man made stuff, kinda like pressed foam,... thor used hex head self taping screws to mount the grilles… most were stripped and fell out when I removed the grilles, that and a vacume load of debris blew out .. I installed mine with mollies and was able to turn the screws to tight..
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