1.the volute select the high quality cold rolling steel plate either the pot galvanize steel plate knee bend weld the system or use nip the shape of the mouth type manufacture. Its line is the logarithmic spiral curve; the lift-drag ratio is good. 2.The air blower air outlet may 0°, 90°, 180°, 270° four kind of position installments, like the following chart. 3. Before the impeller central disk, side the plate, the curved circular arc leaf blade is the ramming formation, the impeller assembly uses rolls the rivet. The impeller transient equilibrium quality rank is the G5.6 level. Impeller material is aluminum. 4.The main axle use the high quality carbon steel to make and to pass through the quenching and tempering, phosphorization rust prevention processing, the safety performance is good. 5. The inlet use the high quality steel plate after the spinning formation, guaranteed that the air enters the impeller to import the section evenly, reduces the flowing to lose greatly, raises impeller's efficiency. Product Specification and Technique Parameter: Model No. technique parameter Model No. technique parameter Air Flow (m3/h) pressure PA Noise scopedB) Power KW Air Flow (m3/h) pressure PA Entire pressure scopedB) Power KW HRW-225 600-3000 100-1000 62-64 1.5 HRW-630 7000-40000 150-31000 68-71.5 18.5 HRW-250 1000-5000 150-1500 61.5-64.5 2.2 HRW-710 7000-50000 200-3500 77-77.98 22 HRW-280 1000-6000 150-2000 63-66 3 HRW-800 10000-60000 200-3500 76-78.5 30 HRW-315 1500-8000 200-2000 66-68.5 3 HRW-900 12000-70000 200-2500 78-78.5 30 HRW-355 2000-10000 200-2200 67.5-70 5.5 HRW-1000 20000-100000 300-4000 72-73 45 HRW-400 2000-14000 150-2500 68.5-69.5 7.5 HRW-450 3000-20000 150-2500 70.5-72 10 HRW-500 4000-22000 200-3000 66.5-68.5 12 HRW- 5000-30000 200-3000 69-71 15 Our Services 1. Warranty: 1 Year warranty for all products. 2. Products Quality: ** products inspection before delivery. 3. Just in time delivery: Normally, lead time is 10-15 days. 4. Customized Service: As we have our own molding department, customized service can be provided. 5. Prompt Customers Service: TradeManager,Skype or E-mail will be replied in 24 hours.