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$POAThe NPU 4000 is the largest negative pressure unit in the SMH range. Providing an airflow (with clean filters) of 3552m3/hr (125437 ft3/hr), the NPU 500 is the ideal solution for ventiliating small enclosures or adding to a larger unit to increase the air pulling power. A HEPA filterwith efficiency up to 99.995% ensures that hazardous airborne particles, such as asbestos, are effectively contained, and a prefilter extends the life of the HEPA. SMH has a full range of accessories and spares, and the option to buy or hire the unit, and we also provide expert servicing, testing and repair of our negative pressure units. For other options available, such as variable speed control, to hire an NPU, or to discuss your requirements in more detail, please contact your local branch directly.