While a forklift lift contributes to CO emissions other items do too - like gas heaters. It is the concentration of CO concentration in the ambient air in the working environment you need to be concerned. Last I recall it was a max of 50 ppm per OSHA regulations - could be less today as I've been out of this business since '.07. The air exchange system ventilation system can be the difference in a pass or fail "CO" sniffer test and can vary significantly based on how full or empty the warehouse is and how long the forklift operates and other things
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