DuraVent
DuraVent 25' DuraFlex AL - Aluminum Flex Length Type B Gas Vent Pipe
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
- 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.
- 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.
- UL 1777 Listed Aluminum Liner: Manufactured to meet UL 1777 chimney liner standards, providing a tested and reliable solution for masonry chimney relining projects.
- 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.
- Lightweight Aluminum Construction: Features durable aluminum flex liner construction for easier handling, installation flexibility, and dependable Type B Gas Vent performance.
- Protects Masonry Chimneys: Helps reduce damage caused by flue gas condensation, extending the service life of masonry chimney systems.
- 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 | |