Roof Jacks & Extensions.
Nordyne/Miller/Intertherm Exterior Roof Jack Extension (4 3/8in) (FM-901936)
This extends the crown of the roof jack up an extra 16" to clear drifting snow or down drafts, which may cause pilot outages. The extension consists of two pipes. The inside pipe has a diameter of 4 1/2" on one end and 4 3/8" on the other end. The outside pipe has a diameter of 8 1/2" on one end and 8 3/8" on the other. Screws are included.
Note: The extension must be installed above the roofline. Connections cannot be inside attics