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NVM-4BH HepaFlo dust bags are designed for use with some of Numatics larger vacuum cleaners such as the 750 and 900 sized ranges. It is important that dust bags are used while cleaning with any dry vacuum as it protects the secondary filters of the machine, prolonging the life of the machine. Dust bags also allow the emptying of the machine to be carried out in a much cleaner and controlled manner, the bag contains a bung that covers the inlet once the bag is removed effectively sealing the contents of the bag inside. These bags will fit any machine with a front entry point and a 900 or 750 sized drum; e.g. NTD 750, NVQ900 or HZQ750.