What are the specs for this Orifice?

The correct replacement for Goodman model GMTH045-3 — 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 GMTH045-3 — B4089343.

What symptoms indicate I need a new orifice?

Common symptoms that indicate you need a new 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 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 GMTH045-3 — B4089343

Name: OEM Goodman #43 Burner Orifice for GMTH045-3 — B4089343
Brand: Goodman
SKU: GOODMAN-12507
Price: 5.95 USD
Availability: InStock

SKU: GOODMAN-12507 Brand: Goodman

$5.95 $7.95

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Goodman B4089343 Burner Orifice (#43 Drill Size)

The Goodman B4089343 is a genuine OEM #43 burner orifice (spud) for Goodman GMTH045-3 gas furnaces. The orifice threads into the manifold and precisely meters the flow of natural gas into each in-shot burner. The #43 drill size sets the exact gas flow rate the furnace was engineered for, which directly controls BTU input, flame quality, and combustion efficiency.

Specifications

Part Number: B4089343
Type: Threaded burner orifice / spud
Drill Size: #43
Gas Type: Natural gas (verify before install)
Material: Machined brass
Fits: Goodman GMTH045-3 gas furnaces
Brand: Goodman (OEM)

OEM vs. Generic

Orifice sizing is safety-critical. A genuine Goodman #43 orifice guarantees the bore is machined to spec so the furnace fires at the rated input. An incorrectly sized or poorly drilled generic orifice can cause over-firing, sooting, or a lifted flame. Always match the exact drill number and gas type — OEM removes the guesswork.

Installation Difficulty

Easy (1/5) — Shut off gas and power, unthread the old orifice from the manifold, and thread in the replacement. About 5–10 minutes per orifice. Leak-test the manifold after service. Replace as a set for consistent firing.

Compatible with Goodman GMTH045-3. Confirm gas type and orifice size 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 Orifice fit my Goodman GMTH045-3 — B4089343?

Yes. This is the factory-specified OEM orifice for the Goodman GMTH045-3 — 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 orifice on my Goodman GMTH045-3 — 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 orifice?

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

Is this 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 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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