The Master Flow RBF14X6X8 is a heavy-duty 30-gauge galvanized steel register box designed to create a straight, in-line transition from an 8-inch round pipe or insulated flexible duct to a 14-inch x 6-inch air register or grille. This universal HVAC component features a built-in flange for convenient installation in ceiling applications and is suitable for most residential and commercial heating and cooling systems. For maximum efficiency, seams should be sealed with code-approved sealant or duct tape, and the ductwork should be insulated

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