Z-Flex Takagi-AO Smith-Reliance Concentric-Coaxial Termination 3" 4" 5"

Direct-vent concentric/coaxial termination This part is used to terminate direct-vent (sealed combustion) systems with indoor tankless water heaters and high condensing boilers. This concentric design lets you make only one hole through a sidewall instead of two, one for the intake and another for the exhaust pipe. It includes a bird screen to prevent small animals and insects from entering into the vent system. It is available in two different variable sizes for a wide range of wall thicknesses. Specifications • Vent material: AL29-4C stainless steel• Certification: Tested to meet or exceed Underwriters Laboratories (UL) spec UL1738 and ULS636• Approval: Cat II, III, IV venting• Limited Lifetime Warranty• Choose in the menu from a 3", 4" or 5" air intake connection and exhaust vent connection combination. Available to fit standard or short wall widths. The following diagram is an example of how the 2SVSHTC43 variant (4" diameter exhaust and 3" diameter intake) of this item would be u