... , 3 folds main door, 3000×2600 mm ( W x H), made by bending steel without cover frame, color : blue. Escape door:1 ... assemble,300mm high, quadrate steel support,2 rows of grilles made by flat bar and twisted steel, then painted. 3 rows of ... 2000 mm ( W x L )/pc.Intake air system1x5.5KW turbo fan, total air capacity is 20000 m3/h. Direct drive ...