HEPA Inlet Filters

Inlet HEPA filters are used where the need for make-up air is low, filtered make-up air is critical or the consequences of a loss of ventilation would be extreme. Two basic types of HEPA filters are used: small 2 cfm respirator filters and larger 30-40 cfm canister filters.

Low Efficiency Inlet Filters

Less efficient filters may be used when the inlet air is not required to be of any better quality as the room air and large volumes of make-up air are required. A 1/2 inch thick, 40 perforations per inch reticulated foam sheet can serve as an effective filter. In this application loss of ventilation accident will require special action to prevent contamination of the room-.

 Negative Pressure Systems

 HEPA filtered vacuum cleaners are generally used to ventilate glovebags. Access should be provided through appropriate service sleeves.

 Liquid Drains

 For glovebags that are used to contain liquids, a drain should be provided. The primary method of drainage is through a drain line connected to a collection system from an installed drain assembly.

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