27-47 in. Telescopic Roof Jack, 2.5/12 Pitch.

The flange can flex from 1/12-4/12 pitch.

This roof jack is essential for venting an 80% efficient mobile home gas furnace. To ensure a proper fit, measure the distance from the base of the furnace to the roof flange, then subtract the furnace's height from that measurement. Choose a roof jack that can telescope within this range for a precise fit. For adjusting the roof pitch, check the accessories for the suitable roof wedge.