Main Technical Parameters
Air leakage rate (at differential pressure 300Pa): ≤700m³/m²·h
Resistance at fully open position

Structure
Main components: Valve body, valve blade, shaft, shaft bush, handle, air duct.
Regarding dimensions and valve body thickness:
When diameter φ800, square-to-round transition structure is required; valve body thickness L=350mm (standard L=200mm).

Performance
Normally open under standby condition. The valve can be manually opened and closed, and is equipped with a 6-speed air volume adjustment switch.