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Block direct 680MM shutter industrial exhaust fan fan negative pressure ventilation exhaust equipment! Xinyu LH-DFJ-B02 industrial exhaust fan (or negative pressure fan) dimensions 680x680MM, suitable for small factories, workshops, warehouses and other ventilation, cooling, exhaust, exhaust odors, with high efficiency, large-displacement (19000 m³/h, large displacement products in the products of the same size)!