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If the nature of any work being done in a room or area is of such a character that dangerous or noxious dust, fumes, mists, gases, odors or other contaminants harmful to workers or occupants may get discharged, the ventilating requirements found in Table 18-28-403.3 shall be supplemented by using a local mechanical exhaust to remove the emission at its source, to prevent the escape of contaminants to the occupied space, and to discharge the mechanical exhaust to the outside atmosphere. Such mechanical exhaust shall be equipped with suitable means for the collection and removal of the contaminates. See Article 5, Exhaust Systems.
Ventilating systems that serve anaesthetizing rooms, intensive care rooms, patient rooms, operating rooms, nurseries, delivery rooms and similar health care rooms shall have at least 2 banks of air filters and shall meet the following requirements:
1. Filter Bank No. 1 shall be installed in the suction side of the supply fan and shall have a minimum air cleaning efficiency rating of 30 percent.
2. Filter Bank No. 2 shall be installed on the pressure side of the supply fan and shall have a minimum air cleaning efficiency rating of 90 percent.
3. All air cleaning efficiencies shall be based on the National Bureau of Standards Dust Spot Test Method and Atmospheric Dust.
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