Model VSI and IVSI are available from 5" I.D. to 48" I.D. Fittings include various elbows, tees, supports and terminations, as well as a variety of accessory fittings designed to make installation simple and quick. Each component is shipped complete and ready for installation. Each ordered part includes Inner Vee Bands, Outer Channel Bands and all the necessary hardware. All items included with each order are listed in this catalog under the part description.

Grease Duct & Integral Fire-Rated Chase

All pipe models are UL 1978 grease duct rated to their relative clearance to combustibles (single-wall, double-wall air or blanket insulated). Zero Clearance grease duct models Z3 & Z4 are additionally UL 2221 rated to zero clearance to combustibles and have an integral 2 hour fire rated enclosure, not requiring a separate fire rated shaft. ZClear™ is the most innovative factory-built kitchen grease duct in the industry. With a zero clearance rating, our integrated chase construction sets the standard for design. Available in both stainless and aluminized steel exteriors, ZClear™ can be customized to your unique application requirements. ZClear™ is the clear choice for new restaurant construction or retrofitting future expansions or modifications.



Since 1994 Centrotherm has been manufacturing the InnoFlue® brand of polyproyplene flue gas venting. InnoFlue® is the most comprehensive line of polypropylene flue gas systems in the industry including Single Wall Residential, Single Wall Commercial, Flex and Concentric vent solutions. In addition to our extensive range of standard vent products, Centrotherm is a full service manufacturer of appliance components for original equipment manufacturers. As the industry leader, Centrotherm is experienced in providing design services, prototyping, testing, and logistics management to its diverse sales channels. Team up any high efficiency gas or oil fired appliance with InnoFlue®, the superior performing, environmentally sustainable vent system that has established a solid track record over nearly two decades of in field service.



DuraVent is a recognized technological leader in the venting industry. Consistently the first to market with new innovations in venting systems, DuraVent has captured a leadership position in emerging markets. DuraVent has patents for several products  and continues to design safe and technologically advanced venting. The company's research into solving problems with corrosion, when biofuels such as corn are used, led to the break-through patent for Pellet Vent Pro.

Scientifically proven materials and unequaled engineering make DuraVent products not only the best choice, or safest choice, but the only choice for professional quality venting products. DuraVent's Engineered Excellence  is a commitment to continue this trend, providing the industry with cutting-edge products and refinements to existing products that not only meet the demands of today’s heating products market, but go beyond it.


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