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501.6 Independent system required.
The following shall be independent of other exhaust systems:
1. Single or combined mechanical exhaust systems from bath, toilet, urinal, locker, service sink closets and similar rooms shall be independent of all other exhaust systems, except as permitted in Section 501.3.1.
2. A separate grease duct system shall be provided for each Type I hood except as provided in Section 506.3.5.
3. Hazardous exhaust systems shall be independent of other types of exhaust systems as provided in Section 510.
502.1 General.
An exhaust system shall be provided, maintained and operated as specifically required by this section and for all occupied areas where machines, vats, tanks, furnaces, forges, salamanders and other appliances, equipment and processes in such areas produce or throw off dust or particles sufficiently light to float in the air, or which emit heat, odors, fumes, spray, gas or smoke, in such quantities so as to be irritating or injurious to health or safety.
502.1.1 Exhaust location.
The inlet to an exhaust system shall be located in the area of heaviest concentration of contaminants.
502.1.2 Fuel-dispensing areas.
The bottom of an air inlet or exhaust opening in fuel-dispensing areas shall be located not more than 18 inches (457.2 mm) above the floor.
502.1.3 Equipment, appliance and service rooms.
Equipment, appliance and system service rooms that house sources of odors, fumes, noxious gases, smoke, steam, dust, spray or other contaminants shall be designed and constructed so as to prevent spreading of such contaminants to other occupied parts of the building.
502.1.4 Hazardous exhaust.
The mechanical exhaust of high concentrations of dust or hazardous vapors shall conform to the requirements of Section 510.
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