DuraSeal® single wall (DS 3"-24", DSLS 26"-36") or double wall (DSD 3"-24", DSLD 26"-36") is a special stainless steel vent system for gas fired appliances listed as Catefory I, II, III, and IV or in Canada as Type BH Gas Venting as noted in ULC-636, with a maximum operating temperature of 550°F (288°C), and a maximum rated positive pressure of 35" water column. It can also vent listed gas or oil fired appliance rated to be vent with TYPE L low temperature venting system (DSD & DSID only). DuraSeal® must be installed by an experienced professional familiar with the operation and maintenance of heating appliances and venting. Before installing this product, examine all components for possible shipping damage and read the complete installation manual. Failure to follow proper installation procedures, including vent pitch and improper appliance connections, may cause unsafe conditions.
Materials and Construction
DuraSeal Single Wall
DuraSeal Double Wall
When assembling two parts together, the joint will overlap 2-3/8". So effective length is normal length minus 2-3/8".
Vertical Installation Requirements:
- The vent system must terminate at least 3 feet above the roof line and at least 2 feet higher than any portion of the building within 10 feet. This limitation can be removed if an engineering analysis demonstrates normal and safe operation of appliance.
- When terminated at a height of more than 10 feet, the stack must be supported by a Guy Section.
- The vent system must terminate with one of the DuraSeal terminations.
Each DuraSeal vent length and component features our Secure Lock system and Viton® o-ring gasket, which insure a gas- and water-tight system. Parts are easily pushed and fastened together instantly and effortlessly. DuraSeal can be taken apart and easily reassembled, making inspection, maintenance or rerouting of DuraSeal systems simple and straightforward.
DuraSeal provides an extensive range of components and accessories, made of stainless steel, allowing any type of installation. On top of the common components, we also offer special parts that help simplify installation, such as the 2-degree elbow and 43-degree tee (simplifying pitching on a horizontal vent) or the 18" and 36" adjustable lengths (to help maximize ease of installation). Connecting the DSD to a heater is effortless with one of the many adaptors approved by heating appliance manufacturers. Heating equipment can be operated immediately upon completing a DuraSeal installation, as no cure time or cleanup is required.
Note: If viton caulking is used at the boiler adaptor or an adjustable length, there is a cure time of 24 hours.
When venting Category I, II, III, or IV appliances or type L vented apliances, DuraSeal must be used for the entire length of the system. Do not mix pipe, fittings, or joining methods from different manufacturers. Every vent system must be planned and installed for optimum performance and safety. The venting system must be free to expand and contract and must be supported in accordance with these instructions. (Check for unrestricted vent movement through walls, ceilings, and roof penetrations). Refer to the gas appliance manufacturer’s instructions to determine venting requirements and limitations with respect to installation and use of the appliance. It is the responsibility of the installer to contact local building and fire officials concerning any installation restrictions and/or inspection requirements that may apply. Permits may be required before starting and installation.
- If required by the appliance manufacturer, a Drain Tee Cap must be located as close as possible to the appliance flue outlet. Depending on the arrangement of the vent, more than one drain may be required. Unless a Drain Tee Cap is supplied with the appliance, install a DuraSeal Drain Tee Cap.
- More than one Category II, III, or IV appliance may not be connected into the same vent system unless the appliance manufacturer specifically approved such a system and the appliance is designed for multiple venting.
- DuraSeal must not come in contact with plumbing or electrical systems.
- Maintain rated clearances to combustibles over the entire length of the vent system.
- DuraSeal shall not be routed into, through, or within any vent, such as an existing masonry or factory-built chimney that is connected to another appliance.
M&G DuraVent Limited Lifetime Warranty
M&G DuraVent, Inc. (“DuraVent") provides this limited lifetime warranty for all of its products with the exception of Ventinox® (lifetime), and PolyPro® (ten years). Subject to the limitations set forth below, DuraVent warrants that its products will be free from defects in material or manufacturing, if properly installed, maintained and used. DuraVent products are fully warranted if installed only by a professional installer. This Warranty is transferable from the original homeowner to the buyer of the home. This warranty does not cover normal wear and tear, smoke damage or damage caused by chimney fires, acts of God, or any product that was: (1) purchased other than from an authorized DuraVent dealer, retailer or distributor; (2) modified or altered; (3) improperly serviced, inspected or cleaned; or (4) subject to negligence or any use not in accordance with the installation instructions included with the product as determined by DuraVent. Installation instructions are available online at www.duravent.com under Support/Literature and through our Customer Service Department 800-835-4429 or email@example.com. This limited lifetime warranty applies only to parts manufactured by DuraVent.
DuraVent provides the following warranties for its products: One Hundred Percent (100%) MSRP 15 years from the date of purchase, and Fifty Percent (50%) thereafter, except for the following limitations on: all Termination Caps and DuraBlack® are warranted at One Hundred Percent (100%) for five years.
All warranty obligations of DuraVent shall be limited to repair or replacement of the defective product pursuant to the terms and conditions applicable to each product line. These remedies shall constitute DuraVent’s sole obligation and sole remedy under this warranty. This warranty provides no cash surrender value. The terms and conditions of this warranty may not be modified, altered or waived by any action, inaction or representation, whether oral or in writing, except upon the express, written authority of an executive officer of DuraVent.
Corn, bio-fuels, driftwood or other wood containing salt, preservative-treated lumber, plastic and household trash or garbage, or wood pellets containing such materials must not be burned in the appliance or fireplace. In case of a chimney fire, the chimney must be inspected and approved by a certified Chimney Sweep before reuse. After each annual inspection, maintenance, and cleaning, the certified Chimney Sweep must fill out and date the appropriate section of the warranty card provided with the chimney liner.
LIMITATIONS ON INTERNET SALES: Notwithstanding any other terms or conditions of this Limited Lifetime Warranty, DuraVent provides no warranty for the following specific products if such products are not installed by a qualified professional installer: DuraTech®, DuraPlus HTC®, DuraChimney® II, PelletVent Pro®, DirectVent Pro®, FasNSeal®, FasNSeal® W2, FasNSeal® Flex, and PolyPro®, and M&G DuraVent’s relining products including DuraLiner®, DuraFlex® (SW, Pro, 316, 304), and Ventinox®. For purposes of this warranty, a trained professional installer is defined as one of the following: licensed contractors with prior chimney installation experience, CSIA Certified Chimney Sweeps, NFI Certified Specialists, or WETT Certified Professionals.
DuraVent must be notified and given the opportunity to inspect defective product prior to replacement under the terms of this limited lifetime warranty. All warranty claims must be submitted with proof of purchase. Labor and installation costs are not covered under this warranty. To obtain warranty service contact: DuraVent Warranty Service, 877 Cotting Ct., Vacaville CA 95688, or call 800-835-4429.
WHERE LAWFUL, DURAVENT DISCLAIMS ALL OTHER WARRANTIES, INCLUDING BUT NOT LIMITED TO IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE. IN NO EVENT WILL DURAVENT BE LIABLE FOR INCIDENTAL, CONSEQUENTIAL, PUNITIVE OR SPECIAL DAMAGES OR DIRECT OR INDIRECT LOSS OF ANY KIND, INCLUDING BUT NOT LIMITED TO PROPERTY DAMAGE AND PERSONAL INJURY. DURAVENT’S ENTIRE LIABILITY IS LIMITED TO THE PURCHASE PRICE OF THIS PRODUCT. SOME STATES DO NOT ALLOW LIMITATIONS ON IMPLIED WARRANTIES, OR THE EXCLUSION OR LIMITATION OF INCIDENTAL OR CONSEQUENTIAL DAMAGES, SO THE ABOVE LIMITATIONS AND EXCLUSIONS MAY NOT APPLY TO YOU. THIS LIMITED WARRANTY GIVES YOU SPECIFIC LEGAL RIGHTS, AND YOU MAY ALSO HAVE OTHER RIGHTS THAT VARY FROM STATE TO STATE.
M&G DuraVent Limited Lifetime Warranty (PDF, 146KB )