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 3mm thick steel core these registers mount to floors or ceilings, damper box cannot be locked in place. Polished and lacquered to prevent tarnishing their traditional scroll design and durable brass plated steel are of superior quality workmanship. Mounting hardware included.