The exhaust box with the specification of 400×500×1300is matched wi th twenty φ76 ×1100 bags. It adopts natural exhaust system with the filtration area of 5.5m2, entire bending and shaping of δ=3 steel plate, seal welding, slag and rust removal on
the surface, spraying two-layer primer and finish for once, which
is convenient for operation and maintenance.