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The Space Savings Benefits of GRZ Grease Ducts

Van-Packer’s Model GRZ is suitable for the removal of smoke and grease laden vapors from commercial, industrial, institutional, and similar cooking applications.


THE Model GRZ fire rated, zero clearance grease duct saves space. The ducts are commonly smaller and allow multiple ducts to be run in a common shaft with minimal clearance space. It can also be installed with no shaft requirements, because the Model GRZ in itself is considered a fire rated enclosure when fire stops are used at the floor openings.

When fire rated duct penetrates a fire rated partition (floor, ceiling or wall), other manufacturer’s instructions require that the duct be centered in a precisely sized hole. The GRZ fire stop penetration design allows the space between the outside surface of the duct and the inside of the hole to vary from 1” to 4”. GRZ grease ducts provide for a more flexible application, reducing labor cost, and exceeding UL 2221 standards.


According to the NFPA, cooking equipment is responsible for 57% of restaurant fires – which causes fires in the grease duct.

All Van-Packer grease duct products are tested, listed and labeled to UL 1978, Standard for Grease Duct. In addition, Models GZ and GRZ grease ducts are tested, listed and labeled to UL 2221, Tests of Fire Resistive Grease Duct Enclosure Assemblies. The requirements of these standards far exceed conditions encountered in the real world.


In many circumstances, wrapped, welded, carbon steel duct, may sag and deform during a grease fire due to the intense heat that is produced in a grease fire. A wrapped duct often has no reinforcement when built, so in a fire can collapse, as shown in the photo. Van-Packer’s unique integral design keeps their duct Model GRZ from collapsing, even when exposed to temperatures of 2000 Degrees. Under ETL’s rigorous testing, it was rare for the duct to even slightly deform, and far exceeded UL 2221 acceptance criteria.


Campbell-Sevey is proud to carry Van Packer’s Model GRZ because we are confident that a grease duct system designed and installed with it will be safe and in service for many years to come. To learn more click to download the Model GRZ spec sheet or contact the team at Campbell-Sevey.

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