UL 586:2017-12 High-Efficiency, Particulate, Air Filter Units

UL 586:2017-12 High-Efficiency, Particulate, Air Filter Units. 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. 2 General 2.1 When a value for measurement is followed by a value in other units in parentheses, the first stated value is the requirement. CONSTRUCTION 3 Frames and Separators 3.1 The frame of a filter unit shall be of metal or other inorganic material, or of wood treated to reduce combustibility by pressure impregnation or the equivalent (a coating is not acceptable as a means to reduce combustibility). 3.2 Treated wood, when employed, shall be not less than 3/4 inch (19 mm) thick and shall have a flame-spread index of 25 or less, determined in accordance with the requirements in the Standard for Test for Surface Burning Characteristics of Building Materials, UL 723. 3.3 A wood frame shall be assembled with butted or rabbeted corner joints that are fastened with screws or double-nailed. 3.4 Frame joints and the abutments of frame with the filter pack shall be impermeable to air flowing at or below the manufacturer’s air-flow rating. 4 Filter Media 4.1 The filter medium shall be glass fiber or other equivalent inorganic material and may include an organic binder material. 4.2 The filter medium shall not contain unbonded asbestos fiber materials. 5 Gaskets 5.1 A gasket, when provided on a unit, shall be securely attached to the frame and shall provide a continuous seal about the face. PERFORMANCE 6 General 6.1 Tests for efficiency and resistance are to be conducted by the manufacturer independently of other tests described herein, employing samples specified in 6.5, following test procedures, and at locations described in Efficiency and Resistance Tests, Section 7. 6.2 Tests for aerosol penetration under ambient conditions and after exposure to heated air, moist air, and low temperatures are to be conducted as described in Penetration Tests, Section 8. 6.3 The Efficiency and Resistance Tests, Section 7, and the Penetration Tests, Section 8, are to be conducted with the aerosol of Poly-alpha-olefin (PAO) synthetic hydrocarbon with a viscosity of 4 centistokes or a suitable alternative. 6.4 A test for flame propagation is to be conducted...