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Small brass gas orifice marked #45 M4

Goodman

Goodman B2589345 Gas Orifice #45 (M4)

SKU CH-2C72-0WCH4

A #45 (M4) gas orifice for Goodman HVAC systems, supplied new with manufacturer-direct shipping

  • Precise #45 (M4) sizing ensures correct gas flow
  • Genuine Goodman part guarantees exact furnace compatibility
  • New condition delivers reliable performance from first ignition
  • Manufacturer-direct supply chain reduces handling and transit time
  • Listed April 29 2023 confirms current production specification

Goodman B2589345 Gas Orifice #45 M4

This Goodman B2589345 gas orifice is a replacement component for compatible HVAC systems. It is intended for technicians and RV owners servicing gas-fired heating equipment. The #45 (M4) designation identifies the specific bore size required for correct fuel metering.

Factory-new condition ensures reliable combustion

Supplied new, the orifice provides a clean, precise opening that supports proper burner ignition and stable flame characteristics. Correct orifice sizing helps maintain the designed heat output and fuel efficiency of the appliance during normal operation.

Direct-from-manufacturer supply simplifies sourcing

This item ships directly from the manufacturer, reducing handling steps and lead time for repair jobs. Orders of $75 or more qualify for free shipping, which can lower the overall cost when purchasing multiple parts or stocking spares. First listed by the manufacturer in April 2023.

Highlights

  • Precise #45 (M4) sizing ensures correct gas flow
  • Genuine Goodman part guarantees exact furnace compatibility
  • New condition delivers reliable performance from first ignition
  • Manufacturer-direct supply chain reduces handling and transit time
  • Listed April 29 2023 confirms current production specification

Specifications

BrandGOODMAN

Questions about this item

How do I install the #45 orifice in my Goodman furnace and what step is often missed?

Thread the M4 orifice into the burner manifold until snug, then verify the stamped #45 marking faces outward so the correct drill size is confirmed during inspection.

What maintenance or replacement will the #45 gas orifice need over time?

Inspect the orifice annually for carbon buildup or corrosion; replace it if the bore shows erosion or if the furnace fails to achieve proper combustion readings.

What limit appears first when the #45 orifice runs continuously during a heating season?

The fixed #45 bore size becomes the limiting factor; it cannot adjust gas flow if manifold pressure drifts, so combustion quality depends entirely on steady supply pressure.

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