... no corrode, the life long The feature of fireproof control valve FFH-2, control valve,discharge fume valveIt is applicable to air vents of ... human can in the room inside control valve.BSD,DC24V,0.5A.,DC24V.Uses the BSD control device, power source DC24V,0.5A ... human can in the room inside control valve.BSFD,DC24V,0.5A.,DC24V.Uses the BSFD control device, power source DC24V,0.5A ...