Commercial Products  >  Chimney & Grease Duct
EPS1, EPS2 and EPS4 Chimney System

PowerStack EPS1, EPS2 and EPS4 are a state-of-the-art, multi-application insulated twin-walled exhaust product designed to convey gases, particles, fumes, smoke, grease and products of combustion.


    • Industry-only multi-use chimney system with 9 UL listings
    • Only chimney system listed for use with Category I, II, III and IV appliances - in a single chimney system!
    • 22 internal diameters ranging from 4 inch (100mm) to 48 inch (1200mm).
    • Fully welded inner liner manufactured in corrosion resistant bespoke 316L-PCM stainless steel
    • Outer jacket of 304 polished stainless steel.
    • Double-wall with 1 inch (25mm), 2 inch (50mm) and 4 inch (100mm) insulation.
    • Full range of components,
    • Industry-only Adjustable Length UL-listed to 60"WC pressure and 1400°F operating temperature
    • Industry-first 3° elbows, 6° elbows, 87° elbows and 87° Tees.
    • Industry-first Flanged male/female jointing system with Graphite gasket


Material Inner Liner: 316L-PCM Stainless Steel
Outer Case: 304 Stainless Steel
Insulation Insulfrax 8.14 lbs/cu.ft (128 kg/m3)
Max. Pressure 60 inWG (14945 Pa)
Max. Temperature 1400°F (760°C) per UL2561
Warranty 1-Year Warranty / Extended 15-Year Warranty
5-Year Performance and Leakage Guarantee
Listing Certification UL 103, Standard for Factory-Built Chimneys for Residential Type and Building Heating Appliances.
UL1738, Standard for Venting System for Gas-Burning Appliances, Catetory II, III and IV
UL 1978, Standard for Grease Duct
UL 2561, Standard for 1400°F Chimneys
ULC/ORD-C959, Standard for 540° and 760°C Industrial Chimney
ULC-S636, Standard for BH Gas Venting Systems
ULC-S662, Standard for Factory-Built Grease Ducts

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File No. MH64314

EPS insulated double wall chimney and grease duct
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