{"product_id":"oem-goodman-43-burner-orifice-for-gmnt070-4b-furnace-b4089343","title":"OEM Goodman #43 Burner Orifice for GMNT070-4B Furnace — B4089343","description":"\u003cp\u003eThe \u003cstrong\u003eGoodman B4089343 Burner Orifice\u003c\/strong\u003e is a genuine OEM #43 drill-size gas orifice (spud) for the \u003cstrong\u003eGMNT070-4B\u003c\/strong\u003e gas furnace and compatible Goodman\/Amana models. The orifice meters the exact volume of natural gas delivered to each in-shot burner, setting the furnace's firing rate and flame quality. A worn, corroded, or incorrectly sized orifice can cause under- or over-firing, sooting, delayed ignition, or a yellow-tipped flame. Using the factory-specified orifice size is essential for safe combustion and rated BTU output.\u003c\/p\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eOrifice size:\u003c\/strong\u003e #43 drill size\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eFuel:\u003c\/strong\u003e Natural gas metering\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eThread:\u003c\/strong\u003e Standard burner manifold spud thread\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eMaterial:\u003c\/strong\u003e Machined brass\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eFits:\u003c\/strong\u003e GMNT070-4B and select Goodman\/Amana furnaces\u003c\/li\u003e\n\u003c\/ul\u003e\u003cp\u003e\u003cstrong\u003eOEM vs. Generic:\u003c\/strong\u003e The genuine B4089343 is precision-drilled to the #43 size Goodman specified for this furnace's manifold pressure and BTU rating. Even a small deviation in orifice diameter changes the gas flow and combustion safety. Off-spec generic orifices risk improper firing rates, so always match the OEM size and never enlarge an orifice in the field.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eInstallation difficulty:\u003c\/strong\u003e Moderate (⭐⭐⭐☆☆). Shut off the gas supply, remove the manifold, and thread in the replacement orifices — one per burner. Roughly 30 minutes. Leak-test all connections with the gas back on. A licensed technician is recommended for gas-side work.\u003c\/p\u003e","brand":"Goodman","offers":[{"title":"Default Title","offer_id":63058129289587,"sku":"GOODMAN-11669","price":5.95,"currency_code":"USD","in_stock":true}],"url":"https:\/\/nationalhvacparts.com\/products\/oem-goodman-43-burner-orifice-for-gmnt070-4b-furnace-b4089343","provider":"National HVAC Parts","version":"1.0","type":"link"}