1) I type: it has a large bellows for positive pressure drawing; it has main
air-duct and accessorial air-duct. Permeating quantity of web curtain
is about 12,000 - 13,000m?/h
2) II type: it uses small bellows and narrow air-duct structure. Permeating
quantity of web curtain is about 8,000 - 9,000m?/h
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