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Each spray booth and spray room shall have an independent exhaust duct system discharging to the outdoors.
Exceptions:
1. Multiple spray booths having a combined frontal area of 18 square feet (1.67m
2
) or less are allowed to have a common exhaust where identical spray-finishing material is used in each booth. If more than one fan serves one booth, such fans shall be interconnected so that all fans operate simultaneously.
2. Where treatment of exhaust is necessary for air pollution control or energy conservation, ducts shall be allowed to be manifolded if all of the following conditions are met:
2.1 The sprayed materials used are compatible and will not react or cause ignition of the residue in the ducts.
2.2 Nitrocellulose-based finishing material shall not be used.
2.3. A filtering system shall be provided to reduce the amount of overspray carried into the duct manifold.
2.4. Automatic sprinkler protection shall be provided at the junction of each booth exhaust with the manifold, in addition to the protection required by this chapter.
The termination point for exhaust ducts discharging to the out-of-doors shall be located with the following minimum distances.
1. For ducts conveying explosive or flammable vapors, fumes or dusts: 30 feet (9144 mm) from the property line;10 feet (3048 mm) from openings into the building; 6 feet (18829 mm) from exterior walls and roofs; 30 feet (9144 mm) from combustible walls and openings into the building which are in the direction of the exhaust discharge; 10 feet (3048 mm) above adjoining grade.
2. For environmental air duct exhaust: 3 feet (914 mm) from the property line; 3 feet (914 mm) from openings into the building.
3. For environmental air duct exhaust 3 feet (914 mm) from the property line; 3 feet (914 mm) from openings into the building.
Electric motors driving exhaust fans shall not be placed inside booths or ducts. Fan rotating elements shall be nonferrous or nonsparking or the casing shall consist of, or be lined with, such material. Belts shall not enter the duct or booth unless the belt and pulley within the duct are tightly enclosed.
Vapor areas of dip tank operations shall be provided with mechanical ventilation adequate to prevent the dangerous accumulation of vapors. Required ventilation systems shall be so arranged that the failure of any ventilating fan will automatically stop the dipping conveyor system.
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