Double Wall Rectangular Grease Duct

Not only has this patented ul 2221 classified product been tested for zero clearance to combustibles it eliminates the need for a fire rated chase with its 2 hour fire rating.

Double wall rectangular grease duct.

Double wall factory built grease duct is ideal for use in applications where reduced clearance or zero inch clearance to combustibles is needed. Duraduct kex is the largest listed kitchen exhaust duct system in the industry. Duct liner shall be of the specified materials thickness and density of the contractors request. Grease duct integral fire rated chase.

Single wall grease duct is etl listed to ul standard 1978 grease ducts and can ulc s662. Duraduct kex is a pre manufactured and non combustible double wall kitchen exhaust duct system. 3 or 4 wall thickness with high temperature dense fiber insulation to meet stringent temperature requirements available in both stainless and aluminized steel exteriors small footprint with minimal horizontal slope required 1 16 per foot as compared to field welded wrapped rectangular duct 1 4 per foot. 2g grease duct systems are tested and listed to ul 1978 and ul 2221.

In double wall rectangular duct a metal inner liner insures that high airflow velocities cannot separate insulation by pulling away from the duct s outer wall and creating erosion or airflow problems. It is rated for 2 hours fire resistance with zero clearance to combustibles and it is compliant with international mechanical code imc national building code of canada nbcc and national fire protection association nfpa codes. Duct requires no on site welding and is leak tested at the factory for quality assurance. This provides some additional characteristic to the duct as well as allowing a few more insulation options.

Double wall grease duct is etl listed to ul standard 1978 and ul standard 2221 grease duct enclosure assemblies. Our prefabricated double wall round grease ducts are designed and built for vertical runs and don t require field welding or secondary insulation. Zero clearance grease duct models z3 z4 are additionally ul 2221 rated to zero clearance to combustibles and have an integral 2 hour fire rated enclosure not requiring a separate fire rated shaft. Double wall rectangular ducts utilize the same outer metal shell and insulation media as our internally lined rectangular ducts but have an additional metal inner shell between the insulation and the airstream.