1.1 These requirements cover high-efficiency, particulate, air-filter units intended for the removal of very fine particulate matter (not less than 99.97 percent of 0.3 micron diameter particles) from the air of industrial and laboratory exhaust and ventilating systems.
1.2 These requirements cover single air filter units.
1.3 These requirements do not cover multiple assembly air filter units.
This revision was issued to incorporate the following:
Revision to Replace Trade Name References with Chemical Name
Clarification of Testing Procedures for Heated Air Test and Spot Flame Test
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