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PDFWAC 296-835-11015

Take additional precautions if you recirculate ventilation system exhaust air into the workplace.

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.
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.
[Statutory Authority: RCW 49.17.010, 49.17.040, 49.17.050, and 49.17.060. WSR 17-18-075, § 296-835-11015, filed 9/5/17, effective 10/6/17. Statutory Authority: RCW 49.17.010, 49.17.040, 49.17.050, and 49.17.060 and 29 C.F.R. 1910 Subpart Z. WSR 14-07-086, § 296-835-11015, filed 3/18/14, effective 5/1/14. Statutory Authority: RCW 49.17.010, [49.17].040, and [49.17].050. WSR 02-15-102, § 296-835-11015, filed 7/17/02, effective 10/1/02.]
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