Product Description

The WESTINGHOUSE 903663 is a slant-style roof jack designed for residential gas furnace flue venting applications. It features an adjustable length ranging from 27 to 47 inches and is constructed from aluminized flue steel for durability and corrosion resistance in exhaust environments. The slant flashing is sized for a 2.5 over 12 rise pitch, making it suited to moderate-slope residential rooflines. This non-transit style roof jack is a component in the B-vent or direct flue stack assembly and is typically installed by a licensed HVAC technician as part of a furnace venting system.

This roof jack is intended for use on residential furnace installations requiring a slant flashing configuration. It is compatible with MG, MB, MS, MM, and M1 series furnace systems as specified by the manufacturer. The adjustable length range accommodates varying roof deck thicknesses and rafter depths, making it adaptable to common residential framing dimensions. It is a non-transit unit, meaning it is not rated for use in transit or mobile applications.

Key Features

Adjustable length from 27 to 47 inches to fit varying roof structures
Aluminized flue steel construction for heat and corrosion resistance
2.5 over 12 rise slant flashing for moderate-pitch rooflines
Non-transit design rated for stationary residential installations
Compatible with MG, MB, MS, MM, and M1 furnace series

Compatibility

Designed for use on MG, MB, MS, MM, and M1 series furnaces as specified by WESTINGHOUSE. Confirm roof pitch and flue diameter before installation.

Installation Notes

Installation should be performed by a licensed HVAC technician in accordance with local mechanical codes and NFPA 54 or applicable fuel gas codes. Shut down and lock out the furnace and gas supply before beginning any venting work. Ensure the flashing is properly sealed against the roof deck to prevent moisture intrusion. Verify that the assembled flue system meets manufacturer clearance requirements before restoring power and gas.

Technical Specifications

Type: Roof Jack, Non-Transit
Material: Aluminized Flue Steel
Adjustable Length: 27 to 47 inches
Flashing Rise: 2.5 over 12
Compatible Furnace Series: MG, MB, MS, MM, M1

Standard Information

Brand: WESTINGHOUSE
Manufacturer Part Number: 903663

Brand	WESTINGHOUSE
MPN	903663

Westinghouse 903663 Furnace Roof Jack Slant 27-47in

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