CBGL4F: 4" ceramic fiber double wall grease duct

  • UL Listing: UL 1978
  • Application: Kitchen Exhaust
  • Operation Temperature: 500°F Continuous
  • Double Wall Spacing: 4" Ceramic Fiber
  • Inner Wall: 304, 316
  • Inside Diameters: 6"- 48"
  • Male/female slip-type jointing system
  • Laser welding
  • Stainless steel material
  • Industrial, institutional and commercial application
  • UL/ULc listed


CBGL4F model Industrial Positive Pressure is a double wall grease duct system with 4" ceramic insulation.


  • Product Overview
  • Related Resources
  • Applications
  • Male/female slip-type jointing system
  • CBI and inner wall standard 316L or 304 2B stainless steel (20 - gauge 6" to 40" diameter, 18 ga 42” to 48”)
  • Full range of accessories including elbows, fittings guides and supports
  • Laser welded
  • Easy to assemble
  • Complete engineering
  • UL/ULc listed


Grease duct products are suitable for installations using exhaust system components for removal of smoke and grease laden vapors in commercial, industrial, institutional and similar type applications.


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  • Kilns and ovens
  • Cooking appliances
  • Ventilation hoods
  • Restaurant grease ducts
  • Pizza oven exhausts
  • Industrial furnaces
  • Processing equipment
  • Low and high pressure steam boilers
  • Diesel and turbine exhausts
  • Building heating equipment