What are the specs for this Burner Orifice?

The correct replacement for Goodman model GMNT140-5B — 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 GMNT140-5B — 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 GMNT140-5B — B4089343

Name: OEM Goodman #43 Burner Orifice for GMNT140-5B — B4089343
Brand: Goodman
SKU: GOODMAN-11786
Price: 5.95 USD
Availability: InStock

SKU: GOODMAN-11786 Brand: Goodman

$5.95 $7.95

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The Goodman B4089343 is a genuine OEM #43 burner orifice (spud) designed for the GMNT140-5B gas furnace. The orifice precisely meters gas flow into each in-shot burner, setting the correct air-fuel mixture for clean, efficient combustion. The #43 drill size is calibrated to the furnace's rated input BTU and gas type.

A worn, enlarged, or incorrectly sized orifice can cause a lazy yellow flame, sooting, incomplete combustion, or under/over-firing. Using the factory-specified orifice size is critical to safe operation and rated efficiency.

Specifications

Type: Burner orifice / spud
Drill size: #43
OEM Part Number: B4089343
Fits: Goodman GMNT140-5B and compatible furnace models
Fuel: Sized for natural gas (LP conversion requires the correct LP orifice)
Thread: Standard Goodman manifold thread

OEM vs. Generic

Genuine OEM orifices are drilled and gauged to exact factory diameters, ensuring correct gas metering and manifold pressure. Generic orifices may have inconsistent bore sizes that shift the firing rate and combustion quality. Because orifice sizing directly affects combustion safety, OEM is the recommended choice.

Installation Difficulty

Easy. Threads into the gas manifold with a wrench after gas and power are shut off. Manifold pressure and flame should be verified afterward. Gas-metering components should be installed and checked by a licensed HVAC technician.

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 GMNT140-5B — B4089343?

Yes. This is the factory-specified OEM burner orifice for the Goodman GMNT140-5B — 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 GMNT140-5B — 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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