Section NR 447.15 - Air cleaning(1) The owner or operator who uses air cleaning, as specified in ss. NR 447.03(1), 447.05(2) (a) 2., 447.08(3) (a) 2. a. or (4) (b), 447.09 (1) (b) 2., 447.10 (2) (a) 2., 447.12 (2) or (3) (a) 2., 447.13 (1) (a) 2. or (b) 2., and 447.18 (5) shall: (a) Use fabric filter collection devices, except as noted in sub. (2), doing all of the following: 1. Ensuring that the airflow permeability, as determined by ASTM Method D737-96, incorporated by reference in s. NR 484.10(10), does not exceed 9 m3/min/m2 (30 ft3min/ft2) for woven fabrics or 11 m3/min/m2 (35 ft3/min/ft2) for felted fabrics, except that 12 m3/min/m2 (40 ft3/min/ft2) for woven and 14 m3/min/m2 (45 ft3/min/ft2) for felted fabrics is allowed for filtering air from asbestos ore dryers.2. Ensuring that felted fabric weighs at least 475 grams per square meter (14 ounces per square yard) and is at least 1.6 millimeter (one-sixteenth inch) thick throughout.3. Avoiding the use of synthetic fabrics that contain fill yarn other than that which is spun.(b) Properly install, use, operate and maintain all air-cleaning equipment authorized by this section. Bypass devices may be used only during upset or emergency conditions and then only for so long as it takes to shut down the operation generating the particulate asbestos material.(c) For fabric filter collection devices installed after January 10, 1989, provide for easy inspection for faulty bags.(2) There are the following exceptions to sub. (1) (a):(a) If the use of fabric creates a fire or explosion hazard, or the department determines that a fabric filter is not feasible, the department may authorize as a substitute the use of wet collectors designed to operate with a unit contacting energy of at least 9.95 kilopascals (40 inches water gage pressure).(b) Use of a High Efficiency Particulate Air (HEPA) filter that is certified to be at least 99.97% efficient for 0.3 micron particles.(c) Use of an alternative filtering equipment that has received prior authorization from the administrator.Wis. Admin. Code Department of Natural Resources NR 447.15
Cr. Register, October, 1992, No. 442, eff. 11-1-92; am. (1) (a) 1., Register, December, 1995, No. 480, eff. 1-1-96; am. (1) (a) 1., Register, November, 1999, No. 527, eff. 12-1-99.