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Ceiling Register Box-B Box (Rectangular)



Our premium HVAC Duct Ceiling Boxes or B-Box, are used to attach a register in the ceiling to supply air in any room. Our B-Boxes are manufactured from the high quality galvanized steel. Sizes listed are the box opening widths, then the round size as the last dimension. They have a plaster ground flange attached for easy finishing to your plaster or drywall.