// CODE SNIPPET
Section M1407 Duct Heaters
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Electric duct heaters shall be installed
so that they will not create a fire hazard. Class 1 ducts, duct
coverings and linings shall be interrupted at each heater to
provide the clearances specified in the manufacturer's installation
instructions. Such interruptions are not required for
duct heaters listed and labeled for zero clearance to combustible
materials. Insulation installed in the immediate area of
each heater shall be classified for the maximum temperature
produced on the duct surface.
Duct heaters shall be accessible for servicing, and clearance shall be maintained to permit adjustment, servicing and replacement of controls and heating elements.
The fan circuit shall be provided
with an interlock to prevent heater operation when the fan is
not operating.
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