Above the flue that valve is called smoke exhaust valve or check valve, I heard there is a five anti exhaust valve
The names are different, and they are acceptable. Five, anti exhaust valve is unique to 10000, the first class of technical effects
The names are different, and they are acceptable. Five, anti exhaust valve is unique to 10000, the first class of technical effects
The names are different, and they are acceptable. Five, anti exhaust valve is unique to 10000, the first class of technical effects
