Westinghouse 903662 Adjustable Roof Jack Mobile Home Furnace

Product Description

The WESTINGHOUSE 903662 is an adjustable roof jack designed for gas furnace venting installations in mobile and manufactured homes. It extends from 21 inches to 35 inches in length, accommodating a range of roof deck thicknesses and installation depths. The unit features aluminized flue steel construction with a 2.5/12 pitch slant flashing base, making it suitable for low-slope roofs commonly found on mobile home applications. Licensed HVAC technicians and qualified installers use this component to properly terminate flue venting through the roof, maintaining a weather-tight seal at the roof penetration point.

This roof jack is intended for mobile and manufactured home gas furnace venting applications. It is rated for use with MG, MB, MS, MM, and M1 furnace series configurations. The sloped flashing base is engineered for a 2/12 roof pitch, which aligns with the shallow roof angles typical in mobile home construction. The adjustable length range of 21 to 35 inches allows the installer to set proper stack height relative to the roof surface without cutting or fabricating custom extensions.

Key Features

• Adjustable length from 21 inches to 35 inches for flexible installation depth
• Aluminized flue steel construction for heat and corrosion resistance
• 2.5/12 pitch slant flashing base matches low-slope mobile home rooflines
• Compatible with MG, MB, MS, MM, and M1 furnace series
• Non-transit design for permanent residential installation

Compatibility

Designed for use with MG, MB, MS, MM, and M1 series mobile and manufactured home gas furnaces as stated by the manufacturer.

Installation Notes

Installation should be performed by a licensed HVAC technician in accordance with local mechanical codes and the furnace manufacturer's venting instructions. Shut down and lock out the furnace and gas supply before beginning any work on the flue or roof penetration. Ensure the flashing base seats flush against the roof surface and is properly sealed to prevent moisture intrusion. Verify that the finished stack height meets minimum clearance requirements above the roof line as specified by the applicable mechanical or fuel gas code.

Technical Specifications

• Adjustable Length Range: 21 to 35 inches
• Roof Pitch: 2/12 (2.5/12 rise)
• Material: Aluminized flue steel
• Installation Type: Non-transit (permanent)
• Application: Mobile and manufactured home gas furnace venting

Standard Information

• Brand: WESTINGHOUSE
• Manufacturer Part Number: 903662