Heat Register. Control & SAVE on energy bills with registers that let you control every room’s airflow with their infinitely adjustable louver assembly (damper box). Crafted of brass plate over steel these registers mount to floors or ceilings, damper box cannot be locked in place. Polished and lacquered antique brass finish to prevent tarnishing their traditional scroll design & heavy brass plate are of superior quality workmanship. Mounting hardware included.