wall mounted industrial fan(FB-C) 1,Telescopic adjustment a high degree of freedom 2,Large air volume and low noise 3,Motor with a long service life 4,Strong Wall Bracket 5, 20",26",30"three different size; 6,Suitable for heat-stroke prevention and cooling-down temperature in factories,workshop and warehouse ect,for ventilation and improving environment; NameSpecificationVoltage(V)Power(W)Speed(R/MIN)Air volume(M3/H)NoiseDB(A)wall mounted industrial fan(FB-C) 550 Net2201501400780062550 Close net3801501400780062650 Net22023014001300070650 Close net38023014001300070750 Net22026014001800073750 Close net38026014001800073