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