... " five different size 2,Strong Wall Bracket 3,cast iron motor body 2011 wall mounted ventilating fan(FB-D) 1,Telescopic adjustment ... and low noise3,Motor with a long service life4,Strong Wall Bracket5, 18", 20",24" ,26",30" five different ... Speed(R/MIN)Air volume(M3/H)NoiseDB(A)wall mounted ventilating fan(FB-D)550 Net2201501400780062550 Close net3801501400780062650 Net22023014001300070650 Close ...