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The Aprilaire 6721 is an automatic damper of the following size:
The Aprilaire 6721 Rectangular Duct Damper - 8"x 8" is a rectangular duct damper. This ventilation damper is motorized for zone control systems. This motorized damper measures 7 1/2 inches x 11 1/2 inches x 8 1/2 inches.
The Aprilaire 6721 specifications: