Selkirk Direct Temp Termination vent piece. Fresh air is brought in around the connection, exhaust is expelled at the 4″ end. The termination is installed outside of the home on all through the roof and side wall installations with Direct Temp venting. Rodent/Outlet screen is required to use at the end of the termination piece on side wall installations, vertical rain cap is required on all through the roof applications. Single wall 45 degree elbow and decorative cone are optional (side wall installations).