... (L*W*H)Basement300mm galvanized steel basement, full grilles made by flat bar and round steel then galvanized .2 ramps, external ... , model YDW-4.5s, air capacity:15500m3/h,electric damper for exhaust air.Filtering systemPre-filter, high efficiency filter, exhaust fiberglass ... building or steel column supporting BH-300B Standard preparation stations,prep-station