California Code of Regulations › Title 8 - Industrial Relations › Division 1 - Department of Industrial Relations › Chapter 4 - Division of Industrial Safety › Subchapter 7 - General Industry Safety Orders › Group 20 - Flammable Liquids, Gases and Vapors › Article 137 - Spray Coating Operations › Section 5450 - Ventilation

Current through Register 2024 Notice Reg. No. 28, July 12, 2024
(a) Ventilation
						requirements shall conform to the provisions of Section
						5153 and
						5143 and this Section.
(b) Except as permitted in Section
						5460, each spray booth shall have
						an independent exhaust duct system discharging to the building exterior.
						Multiple cabinet spray booths in which identical spray finishing material is
						used with a combined frontal area of more than eighteen square feet shall not
						have a common exhaust.
(c) The fan
						rotating element shall be nonferrous or nonsparking or the casing shall consist
						of or be lined with such material. There shall be ample clearance between the
						fan rotating element and fan casing to avoid a fire by friction, necessary
						allowance being made for ordinary expansion and loading to prevent contact
						between moving parts and the duct or fan housing. Fan blades shall be mounted
						on a shaft sufficiently heavy to maintain proper alignment even when the blades
						of the fan are heavily loaded, the shaft preferably to have bearings outside
						the duct and booth. All bearings shall be of the self-lubricating type, or
						lubricated from outside the duct.
(d) Electric motors driving exhaust fans
						shall not be placed inside booths or ducts.
(e) Belts shall not enter duct or booth
						unless belt and pulley within the duct or booth are completely
						enclosed.
(f) Where ductwork passes
						through a combustible roof or wall, the roof or wall shall be protected at the
						point of penetration by open space or fire resistive material between the duct
						and the roof or wall.
(g) When
						ducts pass through firewalls, they shall be provided with automatic fire
						dampers on both sides of the wall, except that 3/8-inch steel plates may be
						used in lieu of automatic fire dampers for ducts not exceeding 18 inches in
						diameter.
(h) Exhaust ducts shall
						be constructed of steel and shall be substantially supported. If dampers are
						installed, they shall be maintained so that adequate airflow is maintained at
						all times the ventilating system is in operation. When spray booths are not in
						use and it is necessary to shut off ducts, noncombustible removable covers
						completely closing ducts may be used.
(i) Exhaust ducts shall be protected against
						mechanical damage and have a clearance from unprotected combustible
						construction or other combustible material of not less than 18 inches, except
						if combustible construction is provided with the following protection applied
						to all surfaces within 18 inches, clearances may be reduced to the distance
						indicated:
(1) 28 gauge sheet metal on ¼ -inch
								  asbestos mill board or
								  equivalent..........................
..........................12
								  inches
(2) 28 gauge sheet metal on 1/8 -inch asbestos
								  mill board spaced out one-inch on noncombustible spacers or
								  equivalent..........................
..........................9
								  inches
(3) 22 gauge sheet metal on 1-inch rockwool bats
								  reinforced with wire mesh or the
								  equivalent..........................
..........................3
								  inches
(4) Where ducts are protected with
								  an approved automatic sprinkler system, properly maintained; the clearance may
								  be reduced to 6 inches.
(j) The spray booth exhaust discharge point
						shall be not less than six feet from any combustible exterior wall or roof nor
						discharge in the direction of any combustible construction or unprotected
						opening in any noncombustible exterior wall within 25 feet.
(k) Freshly sprayed articles shall be dried
						only in spaces provided with adequate ventilation to prevent the accumulation
						of flammable vapors. In the event adequate and reliable ventilation is not
						provided such drying spaces shall be considered a spraying area.
1.
						  Amendment filed 7-16-76; effective thirtieth day thereafter (Register 76, No.
						  29).
2. Amendment of subsections (b), (c) and (k) filed 12-5-86;
						  effective thirtieth day thereafter (Register 86, No.
						  51).
Note: Authority cited: Section
							 142.3, Labor
							 Code. Reference: Section
							 142.3, Labor
							 Code.