Main functions and features:
Fuse Action at 280? Valves shut down automatically
Manual closed and opened, the opening angle is not adjustable
Closed signal outputs to chain-closed ventilation equipment
Specifications (L * W * H): 400 * 400 * 250 ~ 2000 * 1250 ** 2510 mm

Structure:
Valve, bushings, control unit

Technical parameters:
Working voltage / current: DC24V 0.7A
Refractory time: 1.5 hours
Air volume: 290 CBM / H * SM standard state
Full drag coefficient at: <0.4