... the action of crawler pump. Meanwhile hot air up to 100,000 level filtration are inhaled ... auxiliary saving and easier to clean. 2, During air intake, three times filtration involving primary filtration, medium filtration ... , can reach 100,000 level purification. During air exhaust, dust abatement can reach 99% by ... the fan blade can be regarded as air inlet or air outlet. The vane bore can meet the ...