Fire exhaust fan to adopt CAD optimized hardware multi-index envisaged exhaust fan pictures, matching molded axial flow impeller, built cryogenic generators, generators specially arranged icing system. Use two-speed direct-drive generators, reaches a machine amphibians (ie, usually sent when using low-temperature exhaust ventilation and fire smoke) is arranged after the electrical control box can control short-range initiative. The presence of low temperature function quality, high frequency, small volume, simple installation (degree, vertical, lifting can be), and other advantages, wider use in top-level construction, drying room, garage heaven, subways, tunnels and other places to send fire smoke and exhaust ventilation Press GA211-2001 eliminate anti-snow machine means low temperature experiments, low energy at 280 ℃ under the above conditions continue to operate for 40 seconds, media measurement at 100 ℃ have 20 hour running time does not protect the exhaust fan service, it has been the country Each fire department must adopt in town fan exhaust system exhaust pipe not end set exhaust valves, fire exhaust fan and exhaust pipe connections smoke damper settings. When the fan control box (cabinet) in manual mode exhaust fan description, not linked with the fire alarm system. Note that exhaust valve and smoke damper is completely different device functions. Smoke damper is usually always open, exhaust fan is turned on when the fire, but when the flue gas temperature reaches 280 ℃, the exhaust damper automatically closes, the linkage has been opened fan stops running. Exhaust valve usually normally closed, opened fire, and alarm host linkage, open the condition that an outbreak of fire alarm system (probe alarm) Fire Alarm System in the automatic state, exhaust valves open automatically start linkage exhaust fan. Introduction exhaust fan exhaust fan _ _ liter by liter Rui Rui Electrical and Mechanical Ventilation and Air Conditioning Electrical Equipment Factory. L Rui HVAC Electrical Equipment Factory (www.dzsrxfkt.com) strong, credible, Shandong Texas fan, ventilation equipment industry has accumulated a large number of loyal customers. The company better work attitude and constantly improving innovative ideas will lead the Swiss mechanical and electrical liter into the brilliant and you work for a better future!