DuraVent DuraFlex AL 3" x 25" Aluminum Length
The DuraVent DuraFlex AL 3" x 25" Aluminum Length is an economical flexible chimney liner component designed for masonry chimney relining with Category I natural gas and liquid propane appliances. This Type B Gas Vent compatible aluminum liner is ideal for natural gas fireplaces, gas furnaces, boilers, water heaters, and wall or space heating applications. It provides a dependable venting pathway while helping protect masonry chimneys from the damaging effects of flue gas condensation.
Built by DuraVent, a trusted leader in chimney liner and venting solutions, the DuraFlex Aluminum flexible liner system delivers lightweight construction, easy installation, and reliable performance for residential and commercial applications. The 25-foot aluminum flex length offers installation flexibility for gas appliance vent replacement, chimney restoration, and Type B Gas Vent relining projects, providing a cost-effective and durable venting solution.
Features
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DuraFlex AL Flexible Aluminum Chimney Liner: The DuraVent DuraFlex AL 3" x 25" Aluminum Length is an economical flexible chimney liner designed for Category I gas-burning appliance venting applications.
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Designed for Draft Hood Gas Appliances: Specifically engineered for use with Category I gas appliances with draft hoods, including gas fireplaces, furnaces, boilers, water heaters, and heating systems.
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UL 1777 Listed Aluminum Liner: Manufactured to meet UL 1777 chimney liner standards, providing a tested and reliable solution for masonry chimney relining projects.
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Available in Multiple Flex Lengths: Offered in 25-foot, 35-foot, and 50-foot flexible liner lengths to support various chimney restoration and gas vent installation requirements.
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Lightweight Aluminum Construction: Features durable aluminum flex liner construction for easier handling, installation flexibility, and dependable Type B Gas Vent performance.
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Protects Masonry Chimneys: Helps reduce damage caused by flue gas condensation, extending the service life of masonry chimney systems.
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Professional DuraVent Venting Solution: Backed by DuraVent’s expertise in chimney liners, flexible vent systems, and HVAC venting products for residential and commercial applications.
Specifications
| Model |
Size |
Flex Length |
| 3DFA-25 |
3" I.D |
25 ft. |
| 4DFA-25 |
4" I.D |
25 ft. |
| 5DFA-25 |
5" I.D |
25 ft. |
| 55DFA-25 |
5.5" I.D |
25 ft. |
| 6DFA-25 |
6" I.D |
25 ft. |
| 7DFA-25 |
7" I.D |
25 ft. |
| 8DFA-25 |
8" I.D |
25 ft. |
| Vent Type |
Type B Gas Vent |
| Materials & Const. |
010” aluminum (2-ply of .005”) |
| Clearance |
0” clearance to masonry |
| Listings |
Listed to UL 1777 and ULC S635 |
| Warranty |
Limited Lifetime Warranty |
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