CVS® Concentric Venting System
An economical venting solution for condensing and noncondensing appliances, the Concentric Venting System (CVS) features a UL1738 approved super-ferritic stainless steel inner wall. The proprietary twist-lock connection eliminates use of clamps or mechanical fasteners and saves installation time. Only one penetration is needed through the roof or the wall for both exhaust and combustion air. Multiple pipe lengths and telescoping pipe extensions eliminate field cutting of pipe. CVS is the only concentric vent system to incorporate o-rings on the inner wall and outer casing to prevent exhaust or combustion air leakage. Custom adapters are available to transition from co-linear to coaxial venting systems. The built-in condensate management system prevents standing condensation. The Concentric Venting System is a fully sealed, gas tight system to deliver superior performance with the heating unit.
Concentric Venting System (CVS) (direct vent or two-pipe system) for use with condensing natural gas or propane Categories II, III and IV appliances or Canadas Type BH Gas Vent Systems, having a maximum rated operating temperature of 500°F. CVS can be used on a wide range of appliances, including: gas boilers, warm air furnaces, water heaters, unit heaters, or tankless water heaters.
Materials and Construction
Unitized concentric construction. Inner: Laser-welded UL approved 444 super-ferritic stainless steel .012" Outer: Laser-welded, paintable, zincalume .018" Silicone O-ring seals on inner liner and outer wall. Precision twist-lock connection on outer wall.
CVS is listed to 0" clearance as a double-wall vent system for Category II, III, and IV appliances, for flue temperature of up to 400-degrees F for horizontal enclosures, and up to 480-degrees F for vertical enclosures. When CVS is used as a concentric/direct vent system, the clearance to combustibles is specified by the appliance manufacturer.
3" inner and 5" outer.
CVS vent pipe is listed to UL 1738 (MH25700) as a double-wall vent system for Category II, III and IV appliances. It is pressure rated to 10 WC for the inner pipe. This product is also intended to be used as a direct vent system for Category II, III and IV appliances or other gas burning appliances that are listed to be used with direct vent pipe.
877 Cotting Ct.
Vacaville, CA 95688
Tel: (800) 835-4429
Fax: (707) 446-4740
Web site: http://www.duravent.com/Duravent.aspx