§ 61.152 Air-cleaning.

(a) The owner or operator who uses air cleaning, as specified in §§ 61.142(a), 61.144(b)(2), 61.145(c)(3)(i)(B)(1), 61.145(c)(4)(ii), 61.145(c)(11)(i), 61.146(b)(2), 61.147(b)(2), 61.149(b), 61.149(c)(1)(ii), 61.150(a)(1)(ii), 61.150(a)(2)(ii), and 61.155(e) shall:

(1) Use fabric filter collection devices, except as noted in paragraph (b) of this section, doing all of the following:

(i) Ensuring that the airflow permeability, as determined by ASTM Method D737-75, does not exceed 9 m /min/m (30 ft /min/ft ) for woven fabrics or 11 /min/m (35 ft /min/ft ) for felted fabrics, except that 12 m /min/m (40 ft min/ft ) for woven and 14 m /min/m (45 ft min/ft ) for felted fabrics is allowed for filtering air from asbestos ore dryers; and