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// CODE SNIPPET

2404.6.1 Drying Operations

California Fire Code 2019 > 24 Flammable Finishes > 2404 Spray Finishing > 2404.6 Sources of Ignition > 2404.6.1 Drying Operations
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Spray booths and spray rooms shall not be alternately used for the purpose of drying by arrangements or methods that could cause an increase in the surface temperature of the spray booth or spray room except in accordance with Sections 2404.6.1.1 and 2404.6.1.2. Except as specifically provided in this section, drying or baking units utilizing a heating system having open flames or that are capable of producing sparks shall not be installed in a flammable vapor areas.

2404.6.1.1 Spraying Procedure

The spraying procedure shall use low-volume spray application.

2404.6.1.2 Drying Apparatus

Fixed drying apparatus shall comply with this chapter and the applicable provisions of Chapter 30. Where recirculation ventilation is provided in accordance with Section 2404.7.2, the heating system shall not be within the recirculation air path.

2404.6.1.2.1 Interlocks

The spraying apparatus, drying apparatus and ventilating system for the spray booth or spray room shall be equipped with interlocks arranged to accomplish all of the following:

  1. Prevent operation of the spraying apparatus while drying operations are in progress.
  2. Where the drying apparatus is located in the spray booth or spray room, prevent operation of the drying apparatus until a timed purge of spray vapors from the spray booth or spray room is complete. This purge time shall be based on completing not fewer than four air changes of spray booth or spray room volume or for a period of not less than 3 minutes, whichever is greater.
  3. Have the ventilating system maintain a safe atmosphere within the spray booth or spray room during the drying process and automatically shut off drying apparatus in the event of a failure of the ventilating system.
  4. Shut off the drying apparatus automatically if the air temperature within the booth exceeds 200°F (93°C).

2404.6.1.2.2 Portable Infrared Apparatus

Where a portable infrared drying apparatus is used, electrical wiring and portable infrared drying equipment shall comply with the California Electrical Code. Electrical equipment located within 18 inches (457 mm) of floor level shall be approved for Class I, Division 2 hazardous locations. Metallic parts of drying apparatus shall be electrically bonded and grounded. During spraying operations, portable drying apparatus and electrical connections and wiring thereto shall not be located within spray booths, spray rooms or other areas where spray residue would be deposited thereon.

Related Code Sections


2404.6.1 Flammable Finishes, Drying Operations
with interlocks arranged to accomplish all of the following: Prevent operation of the spraying apparatus while drying operations are in progress ...
California Fire Code 2019 > 24 Flammable Finishes > 2404 Spray Finishing > 2404.6 Sources of Ignition > 2404.6.1 Drying Operations
2404.6.1 Flammable Finishes, Drying Operations
with interlocks arranged to accomplish all of the following: Prevent operation of the spraying apparatus while drying operations are in progress. Where ...
California Fire Code 2016 > 24 Flammable Finishes > 2404 Spray Finishing > 2404.6 Sources of Ignition > 2404.6.1 Drying Operations
2404.6.1.2 Flammable Finishes, Drying Apparatus
shall be equipped with interlocks arranged to accomplish all of the following: Prevent operation of the spraying apparatus while drying operations ...
California Fire Code 2019 > 24 Flammable Finishes > 2404 Spray Finishing > 2404.6 Sources of Ignition > 2404.6.1 Drying Operations > 2404.6.1.2 Drying Apparatus
2404.6.1.1 Flammable Finishes, Spraying Procedure
The spraying procedure shall use low-volume spray application ...
California Fire Code 2016 > 24 Flammable Finishes > 2404 Spray Finishing > 2404.6 Sources of Ignition > 2404.6.1 Drying Operations > 2404.6.1.1 Spraying Procedure
2404.6.1.1 Flammable Finishes, Spraying Procedure
The spraying procedure shall use low-volume spray application ...
California Fire Code 2019 > 24 Flammable Finishes > 2404 Spray Finishing > 2404.6 Sources of Ignition > 2404.6.1 Drying Operations > 2404.6.1.1 Spraying Procedure
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