Due to limitations in the basement by the subsurface conditions and space, to meet the air flow and pressure conditions and other parameters, the fire's smoke exhaust ventilation systems and usually can be combined with a vertical exhaust fan fire, so we in the underground garage in the dual-speed fan, which is the same fans and the same duct. Under normal circumstances, the fan runs at low speed as exhaust ventilation use, when a fire, fans immediately becomes the high-speed operation, is used as a fire exhaust fan. Such a machine with two, not only to reduce the construction cost dtf exhaust fan, to save space, more importantly, greatly improves the efficiency and reliability of the equipment. If the exhaust and smoke control systems are completely separate sets, but just put fire exhaust fan when the fire runs rarely used, then the failure is difficult to be found in time and get the repair, but when the real fire , but also difficult to ensure smooth operational. The two-speed fan just to overcome this shortcoming exhaust fan, exhaust fan running as usual, there is a problem was discovered in time and get the repairs, and always in a good state of readiness. Nuisance, nuisance smoke is smoke and exhaust system in two parts (BuFen) are saying. Now senior Hou Jian made at the same time to the extent of spatial development (FaZhan) similarly to the depth of the underground development (FaZhan), is made in high-level health underground chamber, harm, exhaust system, especially important. For planning units, while speaking, we should pay more attention in the planning harm, smoke planning. Fire temperature exhaust fan price, Tangshan exhaust fan, Chen Yu-conditioned factory outlets provided by Wu Cheng Chen Yu Air Conditioning Equipment Co.. Wu Cheng Chen Yu Air Conditioning Equipment Co., Ltd. (www.wccykt.com) strong, credible, in Dezhou fan, ventilation equipment industry has accumulated a large number of loyal customers. The company better work attitude and constantly improving innovative ideas will lead Chenyu air conditioning and you hand into the brilliant, for a better future!