Exhaust Recirculation Policy

The air to be recirculated contains process contaminants whose PEL is equal to or exceeds 1,000 parts per million (ppm), or 15 milligrams per cubic meter (mg/m3). 2. The work area in question is ventilated with an exhaust and air supply system which provides an air flow rate of at least one cubic foot of air per minute (cfm) per square foot of ... ................
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