DuraFlex Chimney Liner Installation Guide

BY Collin Champagne Sep 12, 2025

DuraFlex by Simpson Duravent is a flexible relining system for masonry chimneys. DuraFlex SS (Stainless Steel) is for use with gas, wood pellet, oil, or wood appliances, including: fireplace inserts, furnaces, boilers, and water heaters. DuraFelex AL (Aluminum) is for use with natural gas or liquid propane category I, draft hood equipped appliances, and appliances tested and listed to use Type B Gas Vent for a wide range of applications, including: natural gas fireplaces, gas-fired furnaces, boilers, water heaters, and wall or space heating applications.

DuraFlex SS systems are OMNI Listed to UL 1777 and ULC S635 (43-P-02-2). DuraFlex AL systems are UL Listed to UL 1777 (MH14420).

About the Author

Collin Champagne

With over 13 years in the industry, Collin is a National Fireplace Institute (NFI) certified technician and managed content for the eFireplacestore and eCanopy brands. He has achieved the highest NFI certification possible as a Master Hearth Professional and is certified in all three hearth appliance fields: wood, gas, and pellet. With experience with sales and in-field installations, his expertise shines through his technical knowledge and way with words.

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DuraFlex Chimney Liner Installation Guide

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