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LISTINGS
This Grease Duct has been tested and is listed to UL1978, UL2221, CAN/ULC-S144 and testing has been
extended to recognize ASTM E2336 and AC101 due to similar testing criteria. Models 2R, 3R and 3Z are
used for grease duct applications when installed in accordance with these instructions and National Fire
Protection Association “NFPA 96”; Standard for Ventilation Control and Fire Protection of Commercial
Cooking Operations.
This Factory Built Chimney has been tested and is listed to UL103 and UL103HT. Testing has been
extended to recognize ULC/ORD-C959-1993, unenclosed installation and is for commercial use only.
Model 2R Type HT chimney system was subjected to a 30 minute exposure at a flue gas temperature test
at 1125° C above room temperature in accordance with Canadian Standards with acceptable results
attained.
Model 2R Type HT chimney system has been tested and is listed for installations in positive pressure
applications where the chimney is subject to positive pressure rather than negative or neutral pressures.
The chimney system is rated for use at maximum 60 inch water column internal pressure when used in
Positive Pressure Applications.
This chimney system is intended for installation within commercial/industrial applications and is not
intended for use in family dwellings. When installed in accordance with these instructions and National Fire
Protection Association “NFPA 211”; Standard for Chimneys.
CLASSIFICATIONS
UL 2221: Standard for Fire Resistive Grease Duct Enclosure Assemblies. Chapter 7 of this standard
references a test labeled Internal Fire Test. Section 7.1.1 references two installation conditions, Condition
A and Condition B. Condition A represents all installation conditions except for installation within non-
ventilated combustible enclosures. Condition B represents installation within a non-ventilated combustible
enclosure.
UL 103: Standard for Factory Built Chimneys for Residential Type and Building Heating Appliances.
Model 3Z is classified under UL2221 (Test of Fire Resistive Duct Enclosure Assemblies) as an alternate to
2-Hr. fire resistive shaft enclosures with a minimum zero clearance to combustibles (sizes 8” to 36”
diameter). Model 3Z is listed in accordance with the requirements for duct enclosure Condition A and B.
Model 3R is classified under UL2221 (Test of Fire Resistive Duct Enclosure Assemblies) as an alternate to
2-Hr. fire resistive shaft enclosures with a reduced clearance to combustibles (sizes 8” to 24” diameter).
Model 3R is listed in accordance with the requirements for duct enclosure Condition B.
Model 2R is classified under UL2221 (Test of Fire Resistive Duct Enclosure Assemblies) as an alternate to
2-Hr. fire resistive shaft enclosures with a reduced clearance to combustibles (sizes 8” to 18” diameter).
Model 2R is listed in accordance with the requirements for duct enclosure Condition B.
Model 2R Type HT is listed under UL103 (Building Heating Appliance Chimney). Insulated double wall
building heating appliance Chimney / Type HT Factory Built Chimney intended for commercial and
industrial applications in sizes 8” through 16” ID.
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