What are the specs for this Burner Orifice?

The correct replacement for Goodman model GMTH045-3A — B4089343 is this exact part. It is the factory-specified replacement with exact OEM specifications. Using a part with different specifications can cause equipment damage or void your warranty. You can verify this by checking the data plate on your Goodman equipment which lists the model number GMTH045-3A — B4089343.

What symptoms indicate I need a new burner orifice?

Common symptoms that indicate you need a new burner orifice include unusual noises, intermittent operation, complete failure to operate, or visible damage. For specific diagnostic guidance, visit nationalhvacparts.com/pages/hvac-diagnostic.

Is this burner orifice compatible with Bryant or Payne systems too?

Many Goodman parts are cross-compatible with Bryant and Payne systems since all three brands are manufactured by Carrier Global Corporation. The same physical part is often used across multiple brand labels with different model numbers. To verify cross-compatibility, check your Bryant or Payne equipment service manual for cross-compatible part numbers, or contact info@nationalhvacparts.com with your model number for confirmation.

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Goodman

OEM Goodman #43 Burner Orifice for GMTH045-3A — B4089343

Name: OEM Goodman #43 Burner Orifice for GMTH045-3A — B4089343
Brand: Goodman
SKU: GOODMAN-12521
Price: 5.95 USD
Availability: InStock

SKU: GOODMAN-12521 Brand: Goodman

$5.95 $7.99

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The Goodman B4089343 is a genuine #43 burner orifice (gas jet) for the GMTH045-3A furnace and compatible Goodman/Amana models. This precision-drilled brass orifice meters the exact gas flow to each in-shot burner, setting the furnace's rated BTU input. The #43 drill size is factory-matched to the furnace's natural-gas firing rate — using the wrong size causes over- or under-firing, sooting, or safety lockouts.

Specifications

Part number: B4089343
Type: Burner orifice / spud
Drill size: #43
Fits: Goodman GMTH045-3A gas furnace
Material: Machined brass
Thread: Standard Goodman burner spud thread

OEM vs. Generic

OEM Goodman orifices are drilled and gauged to tight tolerances so every burner fires at the certified rate. Generic or re-drilled orifices can vary by several thousandths of an inch — enough to shift flame color, efficiency, and CO output. For a gas metering part, OEM precision is the safe choice.

Install Difficulty: Easy to Moderate

Shut off gas and power, then thread the orifice into the manifold or burner spud and torque snug (do not overtighten). Confirm you're matching natural gas vs. LP requirements. A leak check with soap solution is required after install.

Compatible with GMTH045-3A. Confirm #43 size and fuel type before ordering.

Shipping Information

Orders placed before 3PM CST ship same business day
Standard delivery: 2-5 business days
Express shipping available at checkout
Free shipping on orders over $75
Tracking number emailed upon shipment

Return Policy

30-day returns on unused parts in original packaging
Electrical parts (capacitors, contactors, control boards) are final sale once installed
Email info@nationalhvacparts.com to initiate a return
Refunds processed within 5-7 business days

OEM Goodman #43 Burner Orifice f...

$5.95

Frequently Asked Questions

Does this Burner Orifice fit my Goodman GMTH045-3A — B4089343?

Yes. This is the factory-specified OEM burner orifice for the Goodman GMTH045-3A — B4089343. It is a direct drop-in replacement that fits without modification. Always verify the model number on your equipment nameplate before ordering.

How do I replace the burner orifice on my Goodman GMTH045-3A — B4089343?

Refer to your equipment service manual for model-specific steps. General approach: turn off power, photograph connections, remove old part, install new part, restore power and test. For gas components, hire a licensed technician. Email info@nationalhvacparts.com for guidance.

What symptoms mean I need a new burner orifice?

Common symptoms: unusual noises, intermittent operation, complete failure, or visible damage. Visit our diagnostic hub for symptom-based troubleshooting.

Is this burner orifice compatible with Bryant or Payne too?

Many Goodman parts are cross-compatible with Bryant and Payne since all three brands are manufactured by Carrier Global Corporation. The same physical part is often used across brand labels with different model numbers. To verify: check your Bryant or Payne equipment service manual for cross-compatible part numbers, or email info@nationalhvacparts.com with your model number.

Should I use OEM or aftermarket for my Goodman burner orifice?

OEM recommended for reliability and warranty compatibility. OEM parts match exact factory specifications for proper fit, performance, and safety. While aftermarket alternatives cost less upfront, the risk of improper fit and reduced lifespan usually makes OEM the better value long-term.

How fast does National HVAC Parts ship?

Orders placed before 3:00 PM CST ship the same business day. Standard delivery is 2–5 business days anywhere in the continental United States. Express shipping available at checkout. We ship from Houston, TX to all 50 states. 30-day return policy on all parts.

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