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Subchapter 4. Construction Safety Orders
Article 28. Miscellaneous Construction Tools and Equipment
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§1693. Temporary Heating Devices.

(a) Temporary heating devices shall be of an approved type.

(b) Ventilation.

Fresh air shall be supplied in sufficient quantities to maintain the health and safety of employees. Where natural means of fresh air supply is inadequate, mechanical ventilation shall be provided.

(c) Clearance and Mounting.

(1) Temporary heating devices shall be installed to provide clearance to combustible material not less than the amount in Table A.

(2) Temporary heating devices, which are listed for installation with lesser clearances than specified in Table A, may be installed in accordance with their approval.

                           Table  A 

                                     MINIMUM CLEARANCE
Heating                                                 Chimney 
Appliances                      Sides       Rear      Connector 

Room heater, circulating type.... 12         12           18 
Room heater, radiant-type........ 36         36           18 

(3) Heaters not intended by the manufacturer for use on wood floors shall not be set directly upon them or other combustible materials. When such heaters are used, they shall rest on suitable heat insulating material or at least 1-inch concrete, or equivalent. The insulating material shall extend beyond the heater 2 feet or more in all directions.

(4) Heaters used in the vicinity of combustible tarpaulins, canvas, or similar coverings shall be located at least 10 feet from the coverings. All coverings shall be securely fastened so as to prevent action by the wind from displacing a loose covering and upsetting the heater or igniting the coverings.

(d) Stability. Heaters, when in use, shall be set horizontally level, unless otherwise permitted by the manufacturer's markings.

(e) Solid Fuel Salamanders.

Solid fuel salamanders are prohibited in buildings and on scaffolds.

(f) Oil-Fired Heaters.

(1) Flammable liquid-fired heaters shall be equipped with a primary safety control to stop the flow of fuel in the event of flame failure. Barometric or gravity oil feed shall not be considered a primary safety control.

(2) Heaters designed for barometric or gravity oil feed shall be used only with the integral tanks.

(3) Heaters specifically designed and approved for use with separate supply tanks may be directly connected for gravity feed, or an automatic pump, from a supply tank.

(g) Fire Protection.

At least a 4A:40-B:C rated fire extinguisher shall be readily available for use when temporary heating devices are used.

NOTE: Authority cited: Section 142.3, Labor Code. Reference: Section 142.3, Labor Code.


1. New section filed 10-17-75; effective thirtieth day thereafter (Register 75, No. 42).

2. Amendment of subsections (b)-(e) and (g) filed 1-13-87; effective thirtieth day thereafter (Register 87, No. 4).

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