DuraVent 25' Flex Pipe Length DuraFlex 316 Stainless Steel
The DuraVent 25' DuraFlex 316 Stainless Steel Flex Pipe is a premium flexible chimney liner designed for dependable masonry chimney relining and high-performance venting applications. Manufactured from highly corrosion-resistant 316 stainless steel, this 25-foot chimney liner is ideal for wood-burning fireplaces, wood stoves, non-condensing gas appliances, oil-fired systems, and coal-burning applications where additional corrosion protection is required. Its lightweight, flexible construction allows easier installation in chimneys with minimal offsets while maintaining efficient flue gas flow and reliable draft performance. The DuraFlex 316 liner is UL 1777 and ULC S635 listed, providing safe and code-compliant chimney venting.
Engineered for durability, the DuraFlex 316 stainless steel chimney liner helps protect masonry chimneys from heat, moisture, and corrosive combustion byproducts while improving overall heating system efficiency. This 25-foot flexible chimney liner is an excellent solution for fireplace inserts, furnaces, boilers, and solid-fuel appliances, delivering long-lasting performance in demanding environments. Backed by DuraVent’s trusted chimney venting technology, it provides a professional-grade solution for residential and commercial chimney restoration projects.
Features
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DuraVent 25' DuraFlex 316 Stainless Steel Flex Pipe: Premium 25-foot flexible chimney liner designed for reliable masonry chimney relining and efficient venting performance.
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Heavy-Duty 316 Stainless Steel Construction: Manufactured with high-quality 316 stainless steel alloy for superior strength, durability, and long-term corrosion resistance in demanding chimney applications.
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Compatible with Multiple Appliance Types: Designed for use with solid fuel, non-condensing gas, and oil appliances, including wood stoves, fireplace inserts, furnaces, and boilers.
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Enhanced Corrosion Resistance for Coal Applications: The 316 stainless steel chimney liner provides additional protection when burning coal or sulfur-rich oils, helping extend liner service life.
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Flexible Chimney Liner Design: Easily navigates chimney offsets for simpler installation while supporting proper draft performance and efficient flue gas flow.
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Ideal for Chimney Restoration Projects: Perfect for masonry chimney relining, fireplace insert installations, and chimney liner replacement applications.
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Improves Venting Efficiency: Helps restore chimney performance by providing a durable pathway for exhaust gases and protecting existing chimney structures.
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Professional-Grade DuraFlex Series: Part of the trusted DuraVent DuraFlex 316 liner system, engineered for dependable residential and commercial heating applications.
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UL Listed Chimney Liner Solution: Designed to meet industry safety standards for flexible stainless steel chimney liners and professional relining installations.
Specifications
| Model |
Size |
Flex Length |
| 3DF316-25 |
3" I.D |
25 ft. |
| 4DF316-25 |
4" I.D |
25 ft. |
| 5DF316-25 |
5" I.D |
25 ft. |
| 55DF316-25 |
5.5" I.D |
25 ft. |
| 6DF316-25 |
6" I.D |
25 ft. |
| 7DF316-25 |
7" I.D |
25 ft. |
| 8DF316-25 |
8" I.D |
25 ft. |
| Materials |
316 Stainless Steel |
| Construction |
Single-Wall |
| Clearance |
0” clearance for gas, oil, and pellet applications. |
| Clearance |
1” clearance to masonry for wood-burning |
| Listings |
Listed to UL 1777 and ULC S635 (MH45609). |
| Warranty |
Limited-lifetime warranty |
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