... ] Air Damper (Air Control Damper) Sizes in 150mm, 200mm, 250mm, 300mm, 350mm, 400mm, Code followed by L for 24 V,110V. Specifications:[Metal ] Air ... Damper (Air Control Damper)Power supply: 220V AC +/- 15% 50 / 60Hz (24V ... used5)pack in standard carton size or as request. [Metal ] Air Damper (Air Control Damper)