Types of centrifugal blower fan Kitchen: airflow along the direction of movement of the fan impeller diameter. Exhaust fan axial fan: airflow along the axial movement of the fan impeller. Greater total pressure centrifugal blower motor isolated from the hot gas fumes. Not easily damaged. Small axial fans, in general, high temperature gas fumes to go through the motor, easily damaged. Kitchen is generally recommended to use a centrifugal fan. Centrifugal fans also points to a multi-leaf front and rear wheel to wheel. Before comparing the advantages of the impeller to the impeller and after :() opt for a lower speed (low noise), smaller diameter can get a larger air volume total pressure. Forward impeller drawbacks: low efficiency, high energy consumption, easy cleaning cleaning. After the impeller advantages: high efficiency, energy saving, easy cleaning cleaning. After drawback compared to the impeller to the impeller) to get the same amount of wind and the total pressure required for high speed (and therefore noisy), and a larger diameter before :(. Fire exhaust fan set Location: Distance tunnel fire exhaust fan should not be too close to the side wall exhaust fan, so as not to affect the ventilation exhaust fan fire tunnel wall arranged for a minimum distance from 20 cm, rescue "sentinel" settings. Disaster area is divided into different tunnel roof exhaust fan, exhaust fan fire full advantage of both ends of the inclined shaft and tunnel rescue station designated as the wind and smoke into the new channel htf fire exhaust fan, ventilation must be maintained cross-channel port kitchen exhaust fan in the positive pressure to prevent flue gas flow channel. ventilation system blowing from the direction of the accident tunnel through a secure tunnel to cross the channel, inhibiting the flue gas into a cross-channel and tunnel accident did not occur to meet the evacuees greet When fresh air into the tunnel cross passages and safety, while ensuring that the region needed to wait for fresh air in the tunnel area according to different accident ventilation Disaster different way. "sentinel" Disaster ventilation scheme implemented sentinel relief when the train in "sentinel" within the scope of all the cross-channel contact settings can be inverted to obtain a fresh wind from the fan inside the secure tunnel. exhaust fan exhaust fan model _ _ Changyi Chen Yu-conditioning service by Wu Cheng Chen Yu Air Conditioning Equipment Co., Ltd. available. 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!