Gray Metal Starting Collar with Damper, 326 Model, 5 in Duct, Round Vent Duct, Metal, 6 in L
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Catalog
https://assets.unilogcorp.com/267/ITEM/DOC/Gray_Metal_32612_Catalog.pdf
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Catalog
https://assets.unilogcorp.com/267/ITEM/DOC/Gray_Metal_3265_Catalog.pdf