The 9007611005 Concentric PVC Termination is used when terminating direct-vent (sealed combustion) systems, with Indoor models that require a 3 in. (76 mm) intake and a 3 in. (76 mm) exhaust. This concentric termination provides the convenience of only having to make one penetration through a sidewall instead of two separate penetrations for the intake and exhaust piping. The termination includes a bird screen, restricting small animals, pests, and foreign objects from entering into the vent system.