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. 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 grease duct is etl listed to ul standard 1978 and ul standard 2221 grease duct enclosure assemblies. Single wall grease duct is etl listed to ul standard 1978 grease ducts and can ulc s662. Our prefabricated double wall round grease ducts are designed and built for vertical runs and don t require field welding or secondary insulation.

G series grease duct double wall kitchen exhaust vent 2 ceramic insulated metal fab grease duct products are manufactured in a strictly controlled environment that enhances product precision reliability and safety. 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. Duraduct kex is the largest listed kitchen exhaust duct system in the industry. Duraduct kex is a pre manufactured and non combustible double wall kitchen exhaust duct system.

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. Duct liner shall be of the specified materials thickness and density of the contractors request. Grease duct integral fire rated chase.

This provides some additional characteristic to the duct as well as allowing a few more insulation options. 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. We offers 2 3 and 4 hour blast resistant and fire rated ducts duraducts including zero clearance kitchen grease duct lab exhaust and access doors to allow for cleaning. All pipe models are ul 1978 grease duct rated to their relative clearance to combustibles single wall double wall air or blanket insulated.