DuraVent DuraFlex 304 Stainless Steel Length: a liner coil cut to fit your chimney
The DuraVent DuraFlex 304 Stainless Steel Length is a coil of flexible stainless steel pipe with a ridged wall. It runs inside an existing brick or block chimney, from the appliance connection to the chimney top. One coil covers that distance, or a connector joins two for a taller chimney. DuraFlex Stainless is DuraVent’s flexible stainless steel liner for relining a masonry chimney that vents a wood, pellet, oil, or gas appliance. The 304 is the lightest and least expensive of the three liners. It suits chimneys with few bends and exhaust that is not corrosive. Uses include fireplace inserts, freestanding stoves, furnaces, boilers, and water heaters.
Choose the length first, then the diameter. Lengths from 15 to 35 feet come in diameters from 3 to 8 inches, including 5 1/2 inches. The 50 foot coil comes only in 7 and 8 inch diameters. Your installer cuts the liner to fit on site. The top plate, cap, tee, and pulling tool are sold separately. Need a coil for corrosive exhaust? See the DuraVent DuraFlex 316 Stainless Steel Length liner coil. The DuraVent DuraFlex 304 Stainless Steel Length ships free from My Cozy Outdoors with No Sales Tax (except WY) and the full manufacturer warranty.
Details
SKU: 3DF304-15 | 4DF304-15 | 5DF304-15 | 55DF304-15 | 6DF304-15 | 7DF304-15 | 8DF304-15
SKU: 3DF304-20 | 4DF304-20 | 5DF304-20 | 55DF304-20 | 6DF304-20 | 7DF304-20 | 8DF304-20
SKU: 3DF304-25 | 4DF304-25 | 5DF304-25 | 55DF304-25 | 6DF304-25 | 7DF304-25 | 8DF304-25
SKU: 3DF304-30 | 4DF304-30 | 5DF304-30 | 55DF304-30 | 6DF304-30 | 7DF304-30 | 8DF304-30
SKU: 3DF304-35 | 4DF304-35 | 5DF304-35 | 55DF304-35 | 6DF304-35 | 7DF304-35 | 8DF304-35
SKU: 7DF304-50 | 8DF304-50
Applications
- DuraFlex Pro ultra flexible relining for masonry chimney. Use with gas, wood pellet, oil, or wood appliances. Applications include: fireplace inserts, furnaces, boilers, and water heaters.
- DuraFlex SW smooth wall flexible relining for masonry chimney. Use with gas, wood pellet, oil, or wood appliances. Applications include: fireplace inserts, furnaces, boilers, and water heaters.
- DuraFlex 316 flexible relining for masonry chimney. Use with gas, wood pellet, oil, or wood appliance. Applications include: fireplace inserts, furnaces, boilers, and water heaters. 316 is designed for use in harsher conditions, for more resistance to corrosion, such as coal.
- DuraFlex 304 flexible relining for masonry chimney. Use with gas, wood pellet, oil, or wood appliances. Applications include: fireplace inserts, furnaces, boilers, and water heaters.
Materials and Construction
DuraFlex Pro: Single-wall .005″ 316 stainless steel.
DuraFlex SW: Single-wall .005″ overlapped 316 stainless steel (totalling .010″). Overlapped to create smooth inner wall.
DuraFlex 316 & 304: Single-wall .005” 316 or 304 stainless steel.
Clearances
DuraFlex Pro: 0″ clearance for gas, oil, and pellet applications. 1″ clearance to masonry for wood-burning applications. Insulation is required for 0″ clearance to masonry for wood-burning.
DuraFlex SW: Clearances 0″ clearance for gas, oil, and pellet applications. ” clearance to masonry for wood-burning applications. Insulation is required for 0” clearance to masonry for wood-burning.
DuraFlex 316 & 304: 0″ clearance for gas, oil, and pellet applications. 1″ clearance to masonry for wood-burning applications. Insulation is required for 0″ clearance to masonry for wood-burning.
Diameters
DuraFlex Pro & SW: 3″ – 12″.
DuraFlex 316 & 304: 3″ – 8″.
Listings
DuraFlex Pro: Listed to UL 1777 and ULC S635 (MH45609).
DuraFlex SW: Listed to UL 1777 (MH45609).
DuraFlex 316 & 304: Listed to UL 1777 and ULC S635 (MH45609).