The exhaust is venting toxic gases, such as carbon monoxide, propane, and nitrogen dioxide, from the rear of the machine. The health and safety of individuals working near or around equipment, such as propane powered forklifts, are at risk. Such gases include (but not limited to) carbon monoxide, carbon dioxide, oxygen, nitric oxide, nitrogen dioxide, and hydrogen sulphide. Gases that have density close to that of air should be installed in the breathing zone, aka respiratory zone, which is 4-6 ft from the floor. Gases that are lighter than air should be installed on or near the ceiling, include (but not limited to) ammonia, methane, and hydrogen. Such gases include (but not limited to) carbon dioxide, chlorine, ozone, propane, and refrigerants.
Gases that are heavier than air should be installed 6” from the floor. The focus, of course, is on what this area contains in terms of toxins and gases and how this area can be accurately tested for safety reasons. This is “ 72” above the floor” (ASHRAE Standard…). The breathing or respiratory zone is defined as “the area from which the employee draws air and has been defined as being as close as possible to the nose and mouth and a hemisphere forward of the shoulders with a radius of 6 to 9 inches” (Review of ANSI/ASHRAE Standard 62.1-2004…). It states that “dusts, gases, fumes, vapours and mists found in the workplace environment shall be measured in the respiratory zone of workers or, if this proves to be impossible owing to the lack of equipment for taking sampling in this zone, then outside the breathing zone but in a place located as close as possible to such zone” (Division V: Air Quality: 44 Methods). Recently, Quebec’s regulation has reinforced CETCI’s recommendations.
(CETCI) has always recommended that they be installed in the breathing zone. In contrary, Critical Environment Technologies Canada Inc. In the past, vehicle exhaust gas detectors have been installed on or near the ceiling.
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