What are the specs for this Orifice?

The correct replacement for Goodman model GMNT045-3B — 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 GMNT045-3B — 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.

IMAGE COMING SOON

Goodman

OEM Goodman #43 Burner Orifice for GMNT045-3B — B4089343

Name: OEM Goodman #43 Burner Orifice for GMNT045-3B — B4089343
Brand: Goodman
SKU: GOODMAN-11631
Price: 5.95 USD
Availability: InStock

SKU: GOODMAN-11631 Brand: Goodman

$5.95 $7.95

OEM Guaranteed

Same-Day Ship

30-Day Returns

Secure Checkout

Texas CMBL #19328542014

SAM.gov Registered

Govt POs Accepted

Goodman B4089343 Burner Orifice (#43 Drill Size)

The Goodman B4089343 is a genuine OEM brass burner orifice (spud) sized to a #43 drill bore, designed for the GMNT045-3B furnace and compatible Goodman/Amana models. The orifice meters the precise volume of gas delivered to each in-shot burner. An orifice that is worn, enlarged by cleaning, or the wrong drill size will disrupt the air-fuel ratio and produce sooting, poor flame, or reduced heating capacity.

Specifications

Type: Burner orifice / spud
Drill size: #43
Material: Machined brass
Fuel: Natural gas
OEM Part Number: B4089343
Fits: Goodman GMNT045-3B and compatible models

OEM vs. Generic

The OEM Goodman B4089343 is drilled and gauged to factory tolerance, which is critical because even a fraction of a drill size changes the BTU input. Generic or field-drilled orifices risk over- or under-firing the furnace. We recommend OEM to keep the appliance within its rated, certified input.

Installation Difficulty: Easy

Turn off gas and power, remove the burner to access the manifold, unscrew the old orifice, and thread in the new one snugly—do not overtighten brass into aluminum. Match the drill number stamped on the orifice to your gas type before firing. Leak-check the manifold connection after reassembly.

Confirm your fuel type and model number before ordering; LP conversions use a different orifice.

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 GMNT045-3B — B4089343?

Yes. This is the factory-specified OEM orifice for the Goodman GMNT045-3B — 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 GMNT045-3B — 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.

Menu