Section 296-835-11015 - Take additional precautions if you recirculate ventilation system exhaust air into the workplaceIMPORTANT: This section applies if exhaust air from dipping or coating operations that use flammable liquids, or liquids with flashpoints greater than 199.4°F (93°C) is recirculated back into the work environment.
(1) You must only recirculate air that contains no substance at a concentration that could pose a health or safety hazard to employees.(2) You must make sure any exhaust system that recirculates air into the workplace: (a) Passes the air through a device that removes contaminants;(b) Sounds an alarm and automatically shuts down the dip tank operation, if the vapor concentration of any substance in the exhaust air exceeds twenty-five percent of its LFL;(c) Monitors the concentration of vapor from flammable liquids or liquids with flashpoints greater than 199.4°F (93°C) with approved equipment. Note: | 1. The LFL concentration in the air must be determined after the air passes through the air-cleaning device and before the air reenters the workspace. |
| 2. Most substances will pose a health hazard at a concentration far below twenty-five percent of its LFL. |
Wash. Admin. Code § 296-835-11015
Amended by WSR 14-07-086, filed 3/18/14, effective 5/1/2014Amended by WSR 17-18-075, Filed 9/5/2017, effective 10/6/2017Statutory Authority: RCW 49.17.010, [49.17].040, and[49.17].050 . 02-15-102, § 296-835-11015, filed 7/17/02, effective 10/1/02.