Nortek Global HVAC Furnace Vent Kit High Efficiency For Use With: M3 and M7 Series Furnaces Includes: (2) PVC Elbows � This furnace vent kit makes the installation of new high efficiency gas furnace a snap � With the furnace vent kit you can vent your new furnace up the old roof jack eliminating the need to make a new access for your PVC venting