Miller 903656 Roof Jack Crown Assembly Furnace Replacement

Product Description

The MILLER 903656 is an all-weather roof jack crown assembly designed to minimize pilot light blow-outs caused by wind and weather exposure. It replaces the original crown cap on mobile and manufactured home gas furnaces equipped with a roof jack venting configuration. The outer pipe measures 8.75 inches and fits over approximately an 8.5-inch pipe on the furnace. The inner pipe measures 5.625 inches and fits over approximately a 5.375-inch pipe on the furnace. Overall height is 17.5 inches. Installation instructions are included with the assembly. This part is installed by HVAC technicians servicing mobile home or manufactured housing gas furnace systems.

This crown assembly is suited for residential mobile and manufactured home applications where gas furnaces use a roof jack venting system. It is a direct OEM-style replacement for the original crown cap and is designed for use on roof jacks found on specific Nordyne, Miller, and Intertherm furnace model families. Before ordering, confirm that the existing crown assembly on the unit is removable, as some installations may not accommodate a field replacement of this component.

Key Features

• All-weather design helps reduce pilot light blow-outs from wind and outdoor exposure
• Outer pipe diameter of 8.75 inches fits over approximately 8.5-inch furnace pipe
• Inner pipe diameter of 5.625 inches fits over approximately 5.375-inch furnace pipe
• Overall height of 17.5 inches for proper roof jack clearance
• Includes installation instructions for field replacement
• Compatible with multiple Nordyne, Miller, and Intertherm gas furnace model families

Compatibility

This assembly is compatible with roof jacks found on the following furnace models: MG1E, M1, MBHA, MGBA, MGBB, MGHA, MGHB, MMBA, MMBB, MMHA, MMHB, MSBA, MSBB, MSHA, and MSHB. Also used on M1G and M1M gas furnace applications.

Installation Notes

Installation should be performed by a licensed HVAC technician familiar with mobile or manufactured home gas furnace venting systems. Shut down the furnace and allow all components to cool before beginning work. Verify that the existing crown assembly is removable before proceeding, as not all roof jack configurations support field replacement of this cap. Follow all applicable local mechanical codes and the included installation instructions.

Technical Specifications

• Outer Pipe Diameter: 8.75 inches (fits over approx. 8.5-inch furnace pipe)
• Inner Pipe Diameter: 5.625 inches (fits over approx. 5.375-inch furnace pipe)
• Overall Height: 17.5 inches
• Item Type: Weather Cap / Roof Jack Crown Assembly
• Application: M1G, M1M Gas Furnace

Standard Information

• Brand: MILLER
• Manufacturer Part Number: 903656