... no corrode, the life long The feature of fireproof control valve FFH-2, control valve,discharge fume valveIt is applicable to air vents of ... fume, when the haze achieves 280 automatic closes, the human can in the room inside control valve.BSFD,DC24V,0.5A.,DC24V.Uses ... the BSFD control device, power source DC24V,0.5A ...