DuraVent DuraFlex Stainless – 316 Tee Kit

$762.72

✓ Free Shipping
✓ No Sales Tax (except WY)
✓ 100% Price Match Guarantee

DuraVent Logo

DuraVent Logo    Authorized Dealer – Full Warranty Included

Choose Flex Length *

15’ Flex
20’ Flex
25’ Flex
30’ Flex
35’ Flex
Product price: $762.72
Total options:
Order total:
SKU: 3DF316-15KT Categories: , , Brand:

DuraVent DuraFlex 316 Tee Kit: a side entry liner kit for more corrosive exhaust

The DuraVent DuraFlex 316 Tee Kit is a chimney liner kit for an appliance whose vent enters through the chimney wall. Its 316 stainless steel handles more corrosive exhaust, such as coal exhaust. The box holds a flexible liner coil, a top plate with a welded storm collar to shed rain, a removable chimney cap, and a tee with cap. The tee connects the appliance at the liner’s bottom, where its cap opens for cleaning. DuraFlex Stainless is DuraVent’s flexible stainless steel liner for relining a masonry chimney that vents a wood, pellet, oil, or gas appliance.

Choose a length of 15, 20, 25, 30, or 35 feet, then a diameter from 3 to 8 inches, including 5 1/2 inch. The fittings clamp around the liner’s ridges without drilling or riveting it. The tee attaches before the liner is lowered, and its branch passes through the wall opening. This liner serves residential stoves, inserts, furnaces, boilers, and water heaters, but not condensing gas appliances. Need a connector rather than a tee? See the DuraVent DuraFlex 316 Basic Kit with connector. The DuraVent DuraFlex 316 Tee Kit ships free from My Cozy Outdoors with No Sales Tax (except WY) and the full manufacturer warranty.

Details

SKU: 3DF316-15KT | 4DF316-15KT | 5DF316-15KT | 55DF316-15KT | 6DF316-15KT | 7DF316-15KT | 8DF316-15KT

SKU: 3DF316-20KT | 4DF316-20KT | 5DF316-20KT | 55DF316-20KT | 6DF316-20KT | 7DF316-20KT | 8DF316-20KT

SKU: 3DF316-25KT | 4DF316-25KT | 5DF316-25KT | 55DF316-25KT | 6DF316-25KT | 7DF316-25KT | 8DF316-25KT

SKU: 3DF316-30KT | 4DF316-30KT | 5DF316-30KT | 55DF316-30KT | 6DF316-30KT | 7DF316-30KT | 8DF316-30KT |

SKU: 3DF316-35KT | 4DF316-35KT | 5DF316-35KT | 55DF316-35KT | 6DF316-35KT | 7DF316-35KT | 8DF316-35KT

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).

Instructions

Product Resources

Catalogs

Bulletins

Brochures

Sales Sheets

FAQ

What comes in the DuraFlex 316 Tee Kit?

A Top Plate with welded Storm Collar, a Removable Vertical Cap, a stainless Tee with Cap and a DuraFlex 316 flex length of 15 to 35 feet. It is the kit for an appliance that enters the masonry chimney from the side through a thimble, with the tee’s cap serving as the clean-out at the base of the liner.

How do I pick the length and diameter?

Choose the flex length first, then the diameter from 3 to 8 inches on the second selector. Size the liner to the appliance outlet, never smaller, and measure from the tee at the thimble to a few inches above the chimney crown. The liner can be cut to length with a hacksaw or reciprocating saw, and joints and the tee are clamped as the instructions show.

Which appliances and fuels suit the 316 liner?

Wood-burning stoves, non-condensing gas and oil appliances, furnaces, boilers and water heaters; 316 is the alloy DuraVent recommends where flue gases are more corrosive, such as coal. It is an economical liner for chimneys with minimal offsets, listed to UL 1777 and ULC S635; for a flue with several bends the Pro tee kit is the more flexible choice.

Does a wood stove liner have to be insulated?

For wood burning, yes if you want the zero-clearance listing: a 1/2-inch ProFoil or Flexwrap blanket or 1 inch of TherMix between liner and masonry, otherwise 1 inch of clearance to the masonry is required. Gas, oil and pellet appliances are listed at zero clearance without insulation. Have a sweep confirm whether the masonry itself was built with clearance to combustibles.

How is the tee connected at the thimble?

The tee sits at the bottom of the liner inside the chimney with its branch pointing through the thimble; the stove’s connector pipe attaches to that branch with connectors designed for the liner, and the tee cap closes the bottom for cleaning. Keep single-wall connector pipe 18 inches from combustibles. Thimbles and connectors are in the DuraFlex Stainless category.

Shipping / Freight / Return Info

Same-Day / 24 hour shipping

Same-Day/24 hour shipping - If we have the product in stock, we can ship same day if ordered before 12pm Monday - Friday (CST).

Freight Claims Policy

Please follow these very important steps when it comes to Freight Items that are damaged or missing
  • Open and inspect the order while the delivery driver is present. If delivery driver does not provide sufficient time to do so, please notate the delivery receipt.
  • By signing the delivery receipt without noting any damage or missing items, you confirm that your order arrived complete and in excellent condition.
  • Record any damage or missing pieces directly on the delivery receipt.
  • Do not discard damaged item(s) or any original packaging. For severe damage, write “Refused due to damage” on the delivery receipt and contact us immediately.
  • Report any damage within two business days, including delivery details and photos showing the issue
  • Damaged item(s) must be returned within 30 days. Failure to return them will result in a charge to the original payment method.

Return Merchandise Authorization Policy

Please follow these very important steps when Returning Items. Contact our team.
  • Submit your return request within 30 days of delivery.
  • You will receive an email within 1-2 business days confirming whether your return request has been approved or denied.
  • Please also note that a 20% restocking fee may apply to approved returns
  • If approved, you will receive an itemized Return Authorization, return shipping labels (if requested), and detailed instructions within 1–2 business days
  • From the date this email is received, you will have 14 days to return the product.
  • Once our distributor receives and inspects the returned item(s), your refund will be issued within 1–2 weeks
  • Items returned outside of this process or time frame are not eligible for a refund.

Customer Reviews

Be the first to review this product

What Our Customers Say

Shop by Best Sellers

Fireplace

Get In Touch

Call or Text us for our Best Price

It's important to us to go above and beyond for our clients and make sure you make the right decision for your home.