Roof Jacks & Extensions.
Nordyne/Miller/Intertherm Roof Jack Crown Assembly (FM-903656)
Our redesigned all-weather crown assembly helps minimize pilot light blow-outs.
The outside pipe is 8 3/4" which fits over about an 8 1/2" pipe on the furnace. The inside pipe is 5 5/8" which fits over about a 53/8" pipe on the furnace. It is17.5" tall. Be sure your old crown is removable. Installation instructions are included.
Note: This assembly can be used on the above roof jacks and on roof jacks found on models M1, MBHA, MGBA, MGBB, MGHA, MGHB, MMBA, MMBB, MMHA, MMHB, MSBA, MSBB, MSHA and MSHB.