Leakage Rate Testing and inspection should be qualified special measuring instruments or measuring devices used in line with national standards in force measurement device (flow measurement throttling device) shall erection. Leakage testing device can be ducted or plenum type. Duct testing devices using orifice for metering element, the plenum-type test device using a nozzle for metering elements fans cold water production plant, the measured and design values ??given the last measure of not less than 10 percent qualified. In some large hotel price factory exhaust fan, smoke control engineering basement kitchen exhaust fan manufacturers, clean room engineering and ventilation and air conditioning engineering and other occasions, smoke control system is essential. Design requirements: ⑴ before the end of the suction inlet jet must average speed v is determined according to the bath temperature: air flow velocity on the suction outlet ⑵ v≤ (2 ~ 3) the amount of exhaust v'⑶ suction outlet should be greater than before the jet suction outlet flow cold fans, is the end of the jet flow of 1.1 to 1.25 times the height of the air outlet ⑷ generally 0.010 ~ 0.015H, in order to prevent the occurrence of clogging of the air outlet, air outlet height should be greater than 5.0 ~ 7.0mm. Hair Exit flow rate should not exceed 10 ~ 12m / s, in order to avoid level fluctuation. Kitchen exhaust fan manufacturers _ _ Xingda Riverside area cold fan - fan manufacturers supplied by Hangzhou Xingda ventilation equipment. Hangzhou Xingda ventilation equipment (www.tz1288.com/shop/index_6525.html) strong, credible, in Hangzhou, Zhejiang fan, ventilation equipment industry has accumulated a large number of loyal customers. The company better work attitude and constantly improving ventilation Xingda innovative ideas will lead into the brilliant and you work for a better future!