SHV is a kind of protection system for life and property, especially suitable for large-scale pubic buildings of passenger concentration such as airports, railway stations, exhibition, etc. Once these buildings catch file, will cause huge personnel and economic loss. For these buildings generally with enclosed steel and glass curtain wall structure, when they are on file, fresh air is not timely delivered unless the large number of deadly gas and smoke exhaust in time, which will cause a large number of personnel casualties.

For:Smoke is poisonous: more than 90% of the casualties by smoke is due to toxic;

Smoke reduced visibility: led people’s panic and firefighters’ rescue;

Smoke strengthens the fire spread: heat transferring with smoke fires other places;

Fire consumes a large quantity of oxygen, causes negative-pressure with the building, even collapse inward.