Fire hazards in commercial kitchens include ignition source, flame spread, as well as heat transmission concerns. Proper design, installation, and maintenance of kitchen exhaust ducts is critical to the performance and safety of the kitchen ventilation system. Considerations include access for cleaning and maintenance, proper slope, clearances to combustible construction, and reduced clearance protective assemblies. The latest UL 710 Standard for kitchen hoods has incorporated specific testing requirements for insulation, which allows for reduced clearance to combustible materials. Duct systems must also meet clearance requirements, which involves field-installed fire wrap, as well as pre-insulated double wall ducts evaluated to UL Standard 2221.
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