National Fire Code

Additional Code Information and Code Updates at the bottom of this page.

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3.3.14 Ventilation. As specified in this code, movement of air that is provided for the prevention of fire and explosion. It is considered adequate if it is sufficient to prevent accumulation of significant quantities of vapor-air mixtures in concentrations over one-fourth of the lower flammable limit. [30:1.6] National Fire Code:

5.3* Separation from Other Operations. Spray booths shall be separated from other operations by a minimum distance of 915 mm (3 ft) or by a partition, wall, or floor/ceiling assembly having a minimum fire resistance rating of 1 hour. Multiple connected spray booths shall not be considered as "other operations." Exception: As provided for in Section 13.3.

5.3.1 Spray booths shall be installed so that all parts of the booth are readily accessible for cleaning.

5.3.2 A clear space of not less than 915 mm (3 ft ) shall be maintained on all sides and above the spray booth. This clear space shall be kept free of any storage or combustible construction.

Exception No. 1: This requirement shall not prohibit locating a spray booth closer than 915 mm (3 ft) to or directly against an interior partition, wall, or floor/ceiling assembly that has a fire resistance rating of not less than 1 hour, provided the spray booth can be maintained and cleaned. Exception No. 2: This requirement shall not prohibit locating a spray booth closer than 915 mm (3 ft) to an exterior wall or a roof assembly provided the wall or roof is constructed of noncombustible material and provided the spray booth can be maintained and cleaned. National Fire Code:

6.4 Electrical Devices in Spray Areas. 6.4.1 Electrical wiring and utilization equipment that is located in the spray area and is not subject to deposits of combustible residues shall be suitable for Class I, Division 1; Class I, Zone 1; or Class II, Division 1 locations, whichever is applicable.

6.4.2* Electrical wiring and utilization equipment that is located in the spray area and is subject to deposits of combustible residues shall be listed for such exposure and shall be suitable for Class I, Division 1; Class I, Zone 1; or Class II, Division 1 locations, whichever is applicable.

6.5 Electrical Devices Adjacent to Spray Areas. Electrical wiring and utilization equipment located adjacent to the spray area shall be classified in accordance with 6.5.1 through 6.5.5.

6.5.1 Electrical wiring and utilization equipment located outside, but within 6100 mm (20 ft) horizontally and 3050 mm (10 ft) vertically, of an unenclosed spray area and not separated from the spray area by partitions extending to the boundaries of the area designated as Division 2 or Zone 2 in Figure 6.5.1 shall be suitable for Class I, Division 2; Class I, Zone 2; or Class II, Division 2 locations, whichever is applicable.


FIGURE 6.5.1 Electrical Area Classification for Open Spray Areas. National Fire Code

6.5.2 If spray application operations are conducted within a closed-top, open-face or open-front booth or room, any electrical wiring or utilization equipment located outside of the booth or room but within the boundaries designated as Division 2 or Zone 2 in Figure 6.5.2(a) and Figure 6.5.2(b) shall be suitable for Class I, Division 2; Class I, Zone 2; or Class II, Division 2 locations, whichever is applicable. National Fire Code


FIGURE 6.5.2(a) Class I, Division 2; Class I, Zone 2; or Class II, Division 2 Locations Adjacent to an Open-Faced or Open-Front Spray Booth or Spray Room with Exhaust Ventilation Interlocked with Spray Application Equipment. National Fire Code


FIGURE 6.5.2(b) Class I, Division 2; Class I, Zone 2; or Class II, Division 2 Locations Adjacent to an Open-Faced or Open-Front Spray Booth or Spray Room with Exhaust Ventilation not Interlocked with Spray Application Equipment. National Fire Code

National Fire Code

6.2.5.1 The Class I, Division 2; Class I, Zone 2; or Class II, Division 2 locations shown in Figure 6.5.2(a) and Figure 6.5.2(b) shall extend from the edges of the open face or open front of the booth or room in accordance with the following:

(1) If the exhaust ventilation system is interlocked with the spray application equipment, then the Division 2 or Zone 2 location shall extend 1525 mm (5 ft) horizontally and 915 mm (3 ft) vertically from the open face or open front of the booth or room, as shown in Figure 6.5.2(a). (2) If the exhaust ventilation system is not interlocked with the spray application equipment, then the Division 2 or Zone 2 location shall extend 3050 mm (10 ft) horizontally and 915 mm (3 ft) vertically from the open face or open front of the booth or room, as shown in Figure 6.5.2(b).

6.5.2.2 For the purposes of 6.5.2, interlocked shall mean that the spray application equipment cannot be operated unless the exhaust ventilation system is operating and functioning as designed and spray application is automatically stopped if the exhaust ventilation system fails.

6.5.3 If spray application operations are conducted within an open-top booth, any electrical wiring or utilization equipment located within the space 915 mm (3 ft) vertically from the top of the booth shall be suitable for Class I, Division 2; Class I, Zone 2; or Class II, Division 2 locations, whichever is applicable. In addition, any electrical wiring or utilization equipment located within 915 mm (3 ft) in all directions of openings other than the open top also shall be suitable for Class I, Division 2; Class I, Zone 2; or Class II, Division 2 locations, whichever is applicable.

6.5.4 If spray application operations are confined to an enclosed spray booth or room, any electrical wiring or utilization equipment located within 915 mm (3 ft) of any opening shall be suitable for Class I, Division 2; Class I, Zone 2; or Class II, Division 2 locations, whichever is applicable, as shown in Figure 6.5.4.


FIGURE 6.5.4 Class I, Division 2; Class I, Zone 2; or Class II, Division 2 Locations Adjacent to an Enclosed Spray Booth or Spray Room.

National Fire Code

6.5.5 Open containers, supply containers, waste containers, spray gun cleaners, and solvent distillation units that contain Class I liquids shall be located in areas ventilated in accordance with applicable requirements of Chapter 7.

6.5.5.1 Electrical area classification shall be as follows:

(1) The area within 915 mm (3 ft) in all directions from any such container or equipment and extending to the floor or grade level shall be classified as Class I, Division 1 or Class I, Zone 1, whichever is applicable. (2) The area extending 610 mm (2 ft) beyond the Division 1 or Zone 1 location shall be classified as Class I, Division 2 or Class I, Zone 2, whichever is applicable. (3) The area extending 1525 mm (5 ft) horizontally beyond the area described in (2) up to a height of 460 mm (18 in.) above the floor or grade level shall be classified as Class I, Division 2, or Class I, Zone 2, whichever is applicable. (4) The area inside any tank or container shall be classified as Class I, Division 1, or Class I, Zone 0, whichever is applicable.

6.5.5.2 Electrical wiring and utilization equipment installed in these areas shall be suitable for the location, as shown in Figure 6.5.5.2.


FIGURE 6.5.5.2 Electrical Area Classification for Class I Liquid Operations Around Open Containers, Supply Containers, Waste Containers, Spray Gun Cleaners, and Solvent Distillation Units. National Fire Code
6.6 Light Fixtures.

6.6.1 Light fixtures as shown in Figure 6.6.1 that are attached to the walls or ceilings of a spray area, but are outside of any classified area and are separated from the spray area by glass panels that meet the requirements of Section 5.5, shall be suitable for use in unclassified locations. Such fixtures shall be serviced from outside the spray area. National Fire Code



Part 63 - National Emissions Standards for Hazardous Air Pollutants for Source Categories; Subpart HHHHHH

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