| Control of Harmful Substances by Ventilation | |
| Is the volume and velocity of air in each exhaust system sufficient to gather the dusts, fumes, mists, vapors, or gases to be controlled, and to convey them to a suitable point of disposal? | |
| Are exhaust inlets, ducts and plenums designed, constructed and supported to prevent collapse or failure of any part of the system? | |
| Are clean-out ports or doors provided at intervals not to exceed 12 feet (3.6576 meters) in all horizontal runs of exhaust ducts? | |
| Where two or more different operations are being controlled through the same exhaust system, could the combination of substances involved create a fire, explosion, or chemical reaction hazard in the duct? | |
| Is adequate makeup air provided to areas where exhaust systems are operating? | |
| Is the source point for makeup air located so that only clean, fresh air, free of contaminants will enter the work environment? | |
| Where two or more ventilation systems serve a work area, is their operation such that one will not offset the functions of the other? | |
| Are there other issues? | |
Information courtesy of the U.S. Department of Labor, Occupational Safety & Health Administration.
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