The NAM (Model BD2KL and BD2KLA) is used for Asbestos Abatement. It filters out the surrounding air, keeping the air more safe for workers. This particular unit is a 24"x24"x2" pre-filter (P/N H2003) and a 24"x24"x2" secondary filter (P/N H2002) specs and replacement part numbers for this machine can be located at the following link below... #Abatement #Asbestos #NAM #Negative_Air_machine
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