Product Resources
- Clearances »
- Designing Air Flow Systems »
- Duct Sizing Information »
- Formulas »
- Grease Duct Operation and Installation Manual
- Grease Duct System Certificate of Installation »
- Installation Instructions »
- Product Information »
- Written Specification »
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.
Factory Welded
Ductwork
Single & Double Wall Options
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
- Clearances »
- Designing Air Flow Systems »
- Formulas »
- Grease Duct System Certificate of Installation »
- Double Wall Operation & Installation Manual »
- Product Information »
- Written Specification »
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.
Models DW-2R and DW-3R are ETL listed under file number 1000082319SAT-006 EEV and comply with UL1978, UL2221, CAN/ULC-S115, CAN/ULC-S662, and ASTM E814 Standards.
Model DW-3Z is ETL Listed under file number 1000082319SAT-006 EEV and complies with UL1978, UL2221 and CAN/ULC-S144 Standards.
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-2R | 18" | ID+4 | 1" | 0" |
| DW-3R | 8" - 24" | ID+6 | 3/4" | 0" |
| DW-3Z | 8" - 24" | ID+6 | 0" | 0" |
- 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