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DuraStack®

DuraStack

The DuraStack DIS and DAS venting systems are designed to offer the ultimate in installation convenience and versatility for a variety of applications. Certified for commercial chimney as a modular double-wall positive pressure chimney system. Factory built for boiler breeching, engine exhaust, and chimney stack. Grease duct (DIS only) and diesel exhaust applications. Thick-gauge material for the inner pipe and coupling provides a strong and rigid assembly. Self-centering flue design significantly simplifies and accelerates the installation process. Coupling configuration (patent pending) requires only one locking band and the use of a regular, less expensive, high-temperature silicone sealant.

Available in sizes from 5" to 36" diameters, the DIS line offers double-wall, 2" insulated chimneys, and the DAS offers a 2" air insulated product. For premium corrosion resistance and durability, the inner wall is constructed from .035" Stainless Steel 304 or 316. This is coupled with a .018" Stainless Steel 304, 316 or Galvalume® (Aluminum-zinc coated) steel outer wall. The DIS is lined with the highest-quality insulation, densely packed to ensure low heat loss, maximum draft and a 1" clearance to combustible materials.

  • Specifications
  • Typical Installation
  • Literature
  • Warranty

Applications
5"-36" DuraStack DIS/DAS is a modular double-wall positive pressure chimney system. Factory built for boiler breeching, engine exhaust, and chimney stack. Grease duct (DIS only)

Materials and Construction
5"-12" diameter pipe features inner wall options of .035" 304 or 316 stainless steel. Outer wall options of .018" 304, 316, or galvalume steel. Features a laser weld interior and exterior joint.

14"-24" diameter pipe features inner wall options of .035" 304 or 316 stainless steel. Outer wall options of .018" 304, 316, or galvalume steel. Features a plasma weld interior joint and a pittsburg lock exterior joint.

26"-36" diameter pipe features inner wall options of .035" 304 or 316 stainless steel. Outer wall options of .024" 304, 316, or galvalume steel. Features plasma weld interior joint and a pittsburg lock exterior joint.

Clearances
DIS: 2" clearance for restaurant grease duct and 1" clearance for building heating appliance chimney and 1400°F factory-built chimney.

DAS: 4" clearance for building heating appliance chimney and 1400°F factory-built chimney.

Diameters
5 "-36"

Listings
UL 103, UL 1978 (DIS only), ULC/ORD C959, ULC S604.

Refer to our Typical Venting Installation drawings to select the appropriate component parts for your installation.

DuraStack Typical Installations

Installation Key
1 Flip Top
2 Anchor Plate Ventilated
3 Bellow Joint
4 Wall Guide
5 Wall Support
6 Suspension Band
7 Fixed Support
8 Relief Valve
9 Variable Length
10 Starting Adapter
11 Finishing Cone
12 Adjustable Length
13 Drain Tee Cap
14 Increaser
15 Wall Firestop
16 45° Tee
17 Tee Cap
18 Length
19 Locking Band
20 45° Tee
21 12" Length

Design Recommenation

  • The following design recommendations are general guideline to assist in the design and selection of venting components for your installation. Always follow DuraVent Installation instructions enclosed with the cap or support box before installing your chimney system. Installation instructions can be viewed online at www.duravent.com, under Catalogs and Instructions. Important: Check the manufacturer’s rating plate and instruction manual to confirm that the DuraVent direct vent system is approved for use on the brand name appliance you have selected.
  • The inner and outer pipe diameters should match the outlet size of the appliance.
  • Check the appliance manufacturer’s installation instructions to confirm which types of vent configurations are permitted (i.e. horizontal, vertical, chimney reline, etc.). Also, check for any venting restrictions such as maximum horizontal run, minimum and maximum vertical rise, maximum offset, etc.
  • Be fire safe! Maintain at least the minimum clearances (air-space) between the vent pipe and nearby combustibles, as specified in the appliance manufacturer’s installation instructions. Use proper support and bracing. Follow local building codes and have your venting system inspected.

DuraStack 1 year Standard and 15 year Limited Warranty

This M&G DuraVent 1-year Standard and 15-year Limited Warranty warrants your DuraStack™ DIS and DAS stainless steel multi-fuel double-wall insulated chimney systems (Product) to be free from defects in material and workmanship at the time of manufacture. This 1-year Standard and 15-year Limited Warranty includes all components and fittings. After installation, if covered components manufactured by DuraVent are found to be defective in materials or workmanship during the 1-year Standard and 15-year Warranty period and while the Product remains at the site of the original installation, DuraVent will replace the covered components. DuraVent reserves the right to replace covered components with an equivalent product and the replacement must be carried out in accordance with DuraVent recommendations. If replacement is not commercially practical, DuraVent will, at its option, refund the purchase price or wholesale price of the DuraVent Product, whichever is applicable. Labor or freight costs to remove or replace DuraVent components are not included. THERE ARE EXCLUSIONS AND LIMITATIONS to the 1-year Standard and 15-year Limited Warranty as described herein. DuraVent Grease Duct applications are covered separately (see DuraStack – DIS Grease Duct Applications Warranty) and are not included under this warranty.

Coverage Commencement Date
Warranty coverage begins on the date of shipment from DuraVent.

Exclusions and Limitations
This 1-year Standard and 15-year Limited Warranty applies only if the Product is installed in the United States or Canada and only if used for the application for which it was designed and intended. The Product must be installed and maintained in accordance with the system design, installation and maintenance instructions for the Product and in compliance with all applicable installation and building codes and high-quality, industry-accepted trade practices. Any repaired or replaced product shall be warranted for the duration of time no longer than the remaining or unexpired term of the original warranty.

The 1-year Standard Warranty is extended to the purchaser subject to the following conditions:

  • Generally accepted engineering practices have been followed to determine that sizing and material specifications are suitable for the application and environment involved;
  • The components have been correctly installed in accordance with the system design and installation instructions for the Product as provided by DuraVent;
  • Damage is not a result of burning garbage, waste oil, #6 oil or any other inappropriate or prohibited material in the appliance served by the venting system.

The Extended 15-year Limited Warranty is extended to the purchaser subject to the following additional conditions:

  • The design parameters provided to DuraVent by the responsible engineer at the time of design were and are accurately representative of the operating conditions;
  • The system sizing and design was performed or approved by DuraVent;
  • The boiler or engine exhaust is and has operated free of solvent or refrigerant vapors or any halogenated compound which may cause acid condensates to form within the chimney system;
  • The entire chimney or exhaust system was supplied by DuraVent;
  • Exposed Galvalume and galvanized surfaces are protected with a minimum of one base coat of primer and one finish coat of heatresistant and corrosive-resistant paint at all times. Stainless steel surfaces do not require painting.

This warranty is non-transferable and extends to the original owner only. The Product must be purchased through an DuraVent Agent/Representative and proof of purchase must be provided.

DuraVent will not be responsible for: (a) damages caused by normal wear and tear, corrosion from salt air, accident, riot, fire, flood or acts of God; (b) damages caused by abuse, negligence, misuse, or unauthorized alteration or repair of the Product affecting its stability or performance; (c) damages caused by failing to provide proper maintenance and service in accordance with the design, installation and maintenance instructions for the Product; (d) damages, repairs or inefficiency resulting from faulty installation or application of the Product.

This 1-year Standard and 15-year Limited Warranty covers only parts as provided herein. DuraVent’s entire liability is limited to the purchase price of this Product. In no case shall DuraVent be responsible for materials, components or construction that are not manufactured or supplied by DuraVent or for the labor necessary to install, repair or remove such materials, components or construction. All replacement or repair components will be shipped F.O.B. from the DuraVent manufacturing facility.

Limitation on Liability
It is expressly agreed and understood that the sole obligation of DuraVent and the purchaser’s exclusive remedy under this warranty, under any other warranty, expressed or implied, or in contract, tort or otherwise, shall be limited to replacement, repair, or refund, as specified herein. In no event shall DuraVent be liable for any incidental or consequential damages caused by defects in the Product, whether such damage occurs or is discovered before or after replacement or repair, and whether such damage is caused by DuraVent negligence. DuraVent makes no expressed warranties except as stated in this 1-year Standard and 15-year Limited Warranty. The duration of any implied warranty is limited to the duration of this expressed warranty. No one is authorized to change this 1-year Standard and 15-year Limited Warranty or to create for DuraVent any other obligation or liability in connection with the Product. Some states and provinces do not allow the exclusion or limitation of incidental or consequential damages, so the above limitations or exclusions may not apply to you. The provisions of this 1-year Standard and 15-year Limited Warranty are in addition to and not a modification of or subtraction from any statutory warranties and other rights and remedies provided by law.

Investigation of Claims Against Warranty
DuraVent reserves the right to investigate any and all claims against this 1-year Standard and 15-year Limited Warranty and to decide, in its sole discretion, upon the method of settlement. DuraVent shall in no event be responsible for any warranty work done by a contractor who is not approved without first obtaining DuraVent’s prior written consent.

For the most up-to-date installation instructions, see duravent.com

REV 4.1.2013

Manufactured in Laval, Quebec

DuraStack 1 year Standard and 15 year Limited Warranty (PDF, 147KB )

Grease Duct (DIS) Limited Lifetime Warranty

Industrial and Commercial Chimney and Venting Products Limited Lifetime Warranty
This M&G DuraVent Limited Lifetime Warranty warrants your DuraStack™ – DIS stainless steel multi-fuel double-wall insulated chimney system (Product) in a grease duct application to be free from defects in material and workmanship at the time of manufacture when properly connected to and included as a part of a code-compliant commercial kitchen ventilation system for cooking appliances. This Limited Lifetime Warranty includes all components and fittings. After installation, if covered components manufactured by DuraVent are found to be defective in materials or workmanship during the Limited Lifetime Warranty period and while the Product remains at the site of the original installation, DuraVent will replace the covered components. DuraVent reserves the right to replace covered components with an equivalent product and the replacement must be carried out in accordance with DuraVent recommendations. If replacement is not commercially practical, DuraVent will, at its option, refund the purchase price or wholesale price of the DuraVent Product, whichever is applicable. Labor or freight costs to remove or replace DuraVent components are not included. THERE ARE EXCLUSIONS AND LIMITATIONS to the Limited Lifetime Warranty as described herein.

Coverage Commencement Date
Warranty coverage begins on the date of shipment from DuraVent.

Exclusions and Limitations
This Limited Lifetime Warranty applies only if the Product is installed in the United States or Canada and only if used for the application for which it was designed and intended. The Product must be installed and maintained in accordance with the design, installation and maintenance instructions for the Product and in compliance with all applicable installation and building codes and high-quality, industry accepted trade practices.

This warranty is non-transferable and extends to the original owner only. The Product must be purchased through an DuraVent Agent/Representative and proof of purchase must be provided.

Components and fittings (excludes labor):
Year 1-10 – Replacement of all components and fittings.
Year 11-15 – Replacement at 75% off of the prevailing list price in effect at the time of replacement (25% of the retail list price paid by the consumer).
Year 16+ – Replacement at 50% off of the prevailing list price in effect at the time of replacement (50% of the retail list price paid by the consumer).

DuraVent will not be responsible for: (a) damages caused by normal wear and tear, corrosion from salt air, accident, riot, fire, flood, high wind or acts of God; (b) damages caused by abuse, negligence, misuse, or unauthorized alteration or repair of the Product affecting its stability or performance; (c) damage resulting from failure to reasonably clean, care for or maintain products in accordance with the printed design, installation and maintenance instructions for the Product; (d) damages caused by failing to provide proper maintenance and service in accordance with the design, installation and maintenance instructions for the Product, including damage to the finish of the Product caused by the use of improper solvents/chemicals or improper cleaning methods; (e) damages, repairs or inefficiency resulting from faulty installation or application of the Product; (e) replacement of system sealants as a result of improper installation or a system grease fire.

This Limited Lifetime Warranty covers only parts as provided herein. DuraVent’s entire liability is limited to the purchase price of this Product. In no case shall DuraVent be responsible for materials, components or construction which are not manufactured or supplied by DuraVent or for the labor necessary to install, repair or remove such materials, components or construction. All replacement or repair components will be shipped F.O.B. from the DuraVent manufacturing facility.

Limitation on Liability
It is expressly agreed and understood that the sole obligation of DuraVent and the purchaser’s exclusive remedy under this warranty, under any other warranty, expressed or implied, or in contract, tort or otherwise, shall be limited to replacement, repair, or refund, as specified herein.

In no event shall DuraVent be liable for any incidental or consequential damages caused by defects in the Product, whether such damage occurs or is discovered before or after replacement or repair, and whether such damage is caused by DuraVent negligence. DuraVent makes no expressed warranties except as stated in this Limited Lifetime Warranty. The duration of any implied warranty is limited to the duration of this expressed warranty. No one is authorized to change this Limited Lifetime Warranty or to create for DuraVent any other obligation or liability in connection with the Product. Some states and provinces do not allow the exclusion or limitation of incidental or consequential damages, so the above limitations or exclusions may not apply to you. The provisions of this Limited Lifetime Warranty are in addition to and not a modification of or subtraction from any statutory warranties and other rights and remedies provided by law.

Investigation of Claims Against Warranty
DuraVent reserves the right to investigate any and all claims against this Limited Lifetime Warranty and to decide, in its sole discretion, upon the method of settlement. DuraVent shall in no event be responsible for any warranty work done by a contractor that is not approved without first obtaining DuraVent’s prior written consent.

For the most up-to-date installation instructions, see duravent.com

REV 4.1.2013

Manufactured in Laval, Quebec

Grease Duct (DIS) Limited Lifetime Warranty (PDF, 14KB )