SRJ1 roof jacks fit almost all Nordyne CMF furnaces with 4" vent pipes. It must be installed on a flat surface. To install on a pitched roof, order the correct sloped roof adapter that corresponds with the pitch of your roof. The barrel of the roof jack must hang below the ceiling and connects to vent pipe (available separately), which extends up from the furnace. Adjustments are made by sliding the 4" vent pipe up and down inside the roof jack. The size of the roof jack is determined by measuring the distance from the ceiling to where the flange sets on the roof. This kit includes ceiling trim plates. $ 295.00  all  outside the usa  purchases  duties, taxes and fees any applicable Clearance Entry Fees (CEF) and other import fees. are the buyers reasonability

Note: This jack is designed for roof cavities (ceiling to roof line) of 2”to12”.