First, use: for mines, tunnels, underground topical negative pressure ventilation fan machine. Second, the project specifications duct size tolerance (mm) duct diameter (mm) 300 400 500 600 800 1000 1200 0 ~ ± 6 duct length (m) 3 5 10 0 ~ ± 150 Note: 1, mean diameter duct end zone diameter. 2, duct size table outside diameter or special shape specifications hairdryer, elbows, tees and excessive Festival can be manufactured according to the demand side. 3, duct rings, rings and other metal parts end specifications are subject to special requirements agreed to by both sides for. 4, one end of each section of duct plus joint anti-cloth, with a length of 150-200mm. Three, one hundred meters in diameter duct ventilation duct performance drag (N · S 2 / M 8) one hundred meters of air leakage rate (%) 300 ≤811.0 0.5% 400 ≤196.2 450 ≤121.6 500 ≤54.0 600 ≤23.5 800 ≤6.4 1000 ≤ 2.0 1N · S 2 / m 8 = 1 / 9.8KU four, hairdryer wind-resistant performance in the pressure in the duct above 5000Pa least maintain 5min, no hairdryer disjointed, coated cloth tearing, and Hair Dryers diameter expansion rate of not more than 1% five, marking, packaging, storage and transportation 1, at the end turn away from the duct at the spray innings 300-400mm issued a "safety signs" pattern. 2, hairdryer with bags, sacks and other packaging material 3, hairdryer in storage should be kept clean to prohibit oil, acid, or other materials in contact with rubber or plastic detrimental to the quality of direct sunlight and away from heat sources than 1M, the indoor temperature is kept at -15 ~ 35 ℃, relative humidity maintained at 50% to 80%. 4, hairdryer in delivery, beware of mechanical impact, damage caused by friction, avoid the sun inch shower. 5, the date of the product from the factory, in less than a year storage period, their physical and mechanical performance and safety standards in line with the provisions of MT164-87. For more information please contact: Business Contact: Mengyue Fei Contact phone: 18660761686 Business Want: zhongmei0326 business QQ: 2247579936 E-mail: zhongmeixz@163.com Company Address: 69 High-tech Zone, Jining City, Shandong Province torch Road