Redesigned all-weather crown assembly helps minimize pilot light blow-outs. 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 & MSHB.
Installation instructions included. Outside pipe is 8-3/4" which fits over about an 8-1/2" pipe on the furnace. Inside pipe is 5-5/8" which fits over about a 5-3/8" pipe on the furnace. 17.5" tall. Be sure your old crown is removable.Quick Tech Tip. Instruction Sheet.