Goodman b2589345- Gas Orifice No. 45 GMPN0803-4

Product Description

The GOODMAN b2589345- is a No. 45 gas orifice designed for use in natural gas furnace burner assemblies. This small but critical component controls the flow of gas into the burner, metering fuel delivery to maintain proper combustion. At 0.031 pounds and measuring approximately 0.437 inches in depth and 1.016 inches in height, it is a direct-fit replacement orifice manufactured to OEM specifications. HVAC technicians install this part during burner service, fuel conversion work, or any repair that requires restoring proper gas metering to the heat exchanger section of a forced-air furnace.

This gas orifice is used in residential forced-air gas furnace applications. The raw title references the GMPN0803-4 furnace model as the primary application. It is suited for standard burner assemblies where a No. 45 drill-size orifice is specified. Licensed HVAC technicians performing burner maintenance, combustion tuning, or parts replacement will encounter this orifice as a serviceable wear component during routine or corrective furnace work.

Key Features

• No. 45 orifice sizing for precise gas metering in compatible burner assemblies
• Compact form factor: 0.437 inches depth, 1.016 inches height, 7/16 inches width
• Lightweight at 0.031 pounds for easy handling during burner service
• OEM-style replacement designed for GOODMAN furnace applications
• Manufactured by Lincoln Brass - Mueller, a recognized gas fitting supplier

Compatibility

Referenced application includes the GOODMAN GMPN0803-4 gas furnace. Verify orifice drill size and thread specification against the unit service manual before installation.

Installation Notes

Gas orifice replacement must be performed by a licensed HVAC technician in accordance with local codes and IFGC requirements. Always shut off the gas supply and allow the burner assembly to cool completely before removing the existing orifice. Use the correct fitting tool to avoid cross-threading the orifice seat, and confirm there are no gas leaks at the connection point after reassembly using an approved leak detection method. Do not reuse a damaged or corroded orifice.

Technical Specifications

• Orifice Size: No. 45
• Depth: 0.437 inches
• Height: 1.016 inches
• Width: 0.4375 inches (7/16 inches)
• Unit Weight: 0.031 pounds
• Country of Origin: United States
• Vendor: Lincoln Brass - Mueller

Standard Information

• Brand: GOODMAN
• Manufacturer Part Number: b2589345-