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Approvals

The DW Series has been certified by ITS. This certification mark indicates that the product has been tested to and has met the minimum requirements of a widely recognized (consensus) U.S. and Canadian products safety standard, that the manufacturing site has been audited, and that the applicant has agreed to a program of periodic factory follow-up inspections to verify continued performance.

Model DW Series is ETL Listed under file number 3114021, and complies with UL-1978, as well as CAN/ULC-S662.

Single Wall Ductwork

Standard Features & Benefits

  • ETL Listed to UL Standard 1978 - Grease Ducts and CAN/ULC-S662
  • Ideal for use in kitchen ventilation applications where clearance to combustibles and temperature retention in the duct is not a factor
  • Diameters range from 8" to 24"
  • Duct and accessories are made from stainless steel
  • Multiple accessories including 45 degree elbow, 90 and Tees
  • Access doors available for clean out
  • Transition plates available for duct termination at the curb
  • Submittals and duct CAD files

Installations

Product Resources

Approvals:

The Double Wall Ductwork Series has been certified by ITS. This certification mark indicates that the product has been tested to and has met the minimum requirements of a widely recognized (consensus) U.S. Product safety standard, that the manufacturing site has been audited, and that the applicant has agreed to a program of periodic factory follow-up inspections to verify continued performance.

Model DW-2R, DW-3R AND DW-3Z are ETL Listed under file number 1000082319SAT-006 EEV and complies with UL1978 and UL2221 Standards.

Double Wall Ductwork

Standard Features & Benefits

  • ETL Listed to UL Standard 1978 and UL Standard 2221- Grease Duct Enclosure Assemblies
  • Ideal for use in kitchen ventilation applications where reduced clearance or zero-inch clearance to combustibles is needed
  • Duct sections are constructed of an inner wall and outer wall with insulation in between - inner duct is Single Wall (DW Series) and outer shell is Stainless steel
  • Inner duct diameters range from 8" to 24"
  • Three models are available to meet clearance requirement needs - Model DW-2R, Model DW-3R and Model DW-3Z
  • Rated for continuous operation at 500 degrees F and intermittent operation at 2000 degrees F

Grease Duct Clearances

DUCT MODEL INNER DIAMETER (ID) OUTSIDE DIAMETER CLEARANCE TO COMBUSTIBLES CLEARANCE TO NON-COMBUSTIBLES
DW-2R 8" - 16" ID+4 3/4" 0"
DW-3R 8" - 24" ID+6 3/4" 0"
DW-3Z 8" - 24" ID+6 0" 0"
* 3/4" clearance to combustibles from the surface of the duct outer shell and zero-inch clearance from combustibles from the tip of the outer V clamp
  • Model 3Z is listed in accordance with Condition A and Condition B of UL Standard 2221 - Condition A represents all installation conditions except for installation within non-ventilated combustible enclosure. Condition B represents installation within a non-ventilated combustible structure.
  • Models 2R and 3R are listed in accordance with Condition B of UL Standard 2221 - installation within non-ventilated combustible enclosure
  • Duct systems are allowed to penetrate a fire resistance rated floor when using floor support assembly and fire stop kit

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