BRD Rotaire Register. Rotaire register is molded from durable ABS plastic. The damper mechanism can easily be opened and closed and may be completely removed for full flow. Grill rotates a full 360 degrees to direct air flow where desired. 4 Inch Diameter mounting collar; overall 5 Inch Diameter by 2. 75 Inch Depth. Beige, 4 Inch. Model # H810 Features: BRD Rotaire Register Rotaire register is molded from durable ABS plastic The damper mechanism can easily be opened and closed and may be completely removed for full flow Grill rotates a full 360 degrees to direct air flow where desired 4 Inch Diameter mounting collar; overall 5 Inch Diameter by 2. 75 Inch Depth Beige, 4 Inch.
