SRJ4 roof jack fits most all Nordyne CMF furnaces with 4" vent pipes. Must be installed on a flat surface. To install on a pitched roof, order the correct sloped roof adapter (available below) that corresponds with the pitch of your roof. The outer double-wall of the roof jack is 8" in diameter. The bottom end of the roof jack must hang below the ceiling and connect to vent pipe (available separately) which extends up from the furnace. Adjustment is made by sliding the 4" vent pipe up and down inside the roof jack. Size of roof jack is determined by measuring the distance from the ceiling to where the flange sets on the roof. Includes ceiling trim plates.
Shipping package size is 15x15x66".