M&G DuraVent now offers a solution for positive-pressure chimneys: DuraStack®, a modular, double-wall, positive-pressure chimney system. Fully tested and listed to UL 103, UL 1978, ULC/ORD C959, and ULC S604 standards, DuraStack offers versatility for a variety of applications, including boiler breeching, engine exhaust, chimney stacks, and grease ducts (model DIS only). The DuraStack DIS and DAS venting systems are cylindrical, prefabricated, modular venting systems incorporating a unique extended inner flange designed for quick assembly and pressure-sealing capability.

DuraStack DIS and DAS are composed of a thick-gauge material for the inner pipe and coupling, providing a strong and rigid assembly; have a self centering flue design that significantly simplifies and accelerates the installation process; and have a coupling configuration (patent pending) requiring only one locking band and the use of a regular, less expensive, high-temperature silicone sealant.

Available in diameters of 5 to 36 inches, the DIS line offers double-wall, 2-inch insulated chimneys, and the DAS line offers a 2-inch air-insulated product. For premium corrosion resistance and durability, the inner wall is constructed from 0.035-inch stainless steel (304 or 316). This is coupled with a 0.018-inch outer wall of stainless steel (304 or 316) or Galvalume®(aluminum– zinc alloy) coated steel.

The DIS is lined with the highest quality insulation, densely packed to ensure low heat loss and maximum draft—and to permit a 1-inch clearance to combustible materials.

Information about product specifications and features, as well as the new DuraStack catalog and sales sheets, can be found by visiting www.duravent.com.