Grease Ducts
Our factory built option omits welding in the field and assures customer of 100% air and grease tight construction. Insulated models eliminate second and third trades which can also save a lot of money for the owner. Our sizing and balancing software takes advantage of known resistance on smooth stainless steel inner and fittings to assure best ventilation. With Limited Lifetime Warranties and Underwriter Laboratory’s Listings, these factory built ducts are almost a standard now.
Sample Specifications
Single Wall Option
Prefabricated system listed to UL-1978 Standard for Factory Built Grease Ducts with 304 stainless steel construction. Duct shall be designed for 500°F continuous and 2000°F for 30 minutes (simulating a grease fire).
Reduced Clearance Option
Prefabricated system listed to UL-1978 Standard for Factory Built Grease Ducts with 304 stainless steel inner liner, 1” insulation, and aluminized [304 stainless] steel outer jacket. Duct shall be designed for 500°F continuous and 2000°F for 30 minutes (simulating a grease fire).
Zero Clearance Option
Prefabricated system listed to UL-1978 and UL-2221 Standard for Factory Built Grease Ducts and Integral 2-Hour Rated Shaft Assembly, with 304 stainless steel inner liner, 3” [4”] insulation, and aluminized [304 stainless] steel outer jacket. Duct shall be shall be designed for 500°F continuous and 2000°F for 30 minutes (simulating a grease fire).
Complete with: no-weld hood transitions, no-tool access panels, supports, guides, expansion joints, and connection to fans. All items as specifically required by National and Local Codes.
Submit AutoCAD Drawings with Sizing/Balancing Calculations showing that the grease duct system is in complete compliance with Code, the hood manufacture(s), and the fan manufacture(s) installation instructions.
