{"product_id":"allied-air-14t67-combustion-air-pressure-switch-2-stage","title":"Allied Air 14T67 Combustion Air Pressure Switch 2-stage","description":"\u003ch3\u003eProduct Description\u003c\/h3\u003e\u003cp\u003eThe ALLIED AIR 14T67 is a two-stage combustion air pressure switch kit designed for use in gas furnace systems. It monitors negative air pressure in the flue or heat exchanger proving circuit to confirm proper inducer motor operation before allowing ignition. The high-stage set point is 0.90 inches water column (WC) and the low-stage set point is 0.25 inches WC. This switch is a direct OEM-style replacement part installed by licensed HVAC technicians during routine maintenance, system diagnostics, or failed-switch replacement service calls.\u003c\/p\u003e\u003cp\u003eThis switch applies to two-stage gas furnace installations where the inducer assembly must prove adequate combustion airflow at two distinct firing rates. Two-stage pressure switches are common in residential and light-commercial furnaces running at both partial and full heat output. The 14T67 is also cross-referenced as Lennox 104937-02, making it a recognized replacement in service environments that stock or order by OEM part number.\u003c\/p\u003e\u003ch4\u003eKey Features\u003c\/h4\u003e\u003cul\u003e\n\u003cli\u003eTwo-stage design with separate high and low set points: 0.90 WC and 0.25 WC\u003c\/li\u003e\n\u003cli\u003eOEM-style replacement for proven inducer proving circuit applications\u003c\/li\u003e\n\u003cli\u003eCross-referenced to Lennox 104937-02 for straightforward parts identification\u003c\/li\u003e\n\u003cli\u003eMonitors negative pressure to confirm safe combustion airflow before ignition\u003c\/li\u003e\n\u003cli\u003eSuitable for residential and light-commercial two-stage gas furnace systems\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch4\u003eCompatibility\u003c\/h4\u003e\u003cp\u003eCross-referenced as a replacement for Lennox 104937-02. Designed as an OEM-style replacement for two-stage residential and light-commercial gas furnace systems requiring dual set-point combustion air pressure switches.\u003c\/p\u003e\u003ch4\u003eInstallation Notes\u003c\/h4\u003e\u003cp\u003eInstallation should be performed by a licensed HVAC technician. Shut off all electrical power and gas supply to the furnace before removing or installing the pressure switch. Inspect the pressure switch hose and port for cracks, blockages, or moisture before completing the swap, as a compromised hose will cause repeat failure. Follow applicable local codes and the IFGC for gas appliance service procedures.\u003c\/p\u003e\u003ch4\u003eTechnical Specifications\u003c\/h4\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eSet Point High\u003c\/strong\u003e: 0.90 inches water column (WC)\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eSet Point Low\u003c\/strong\u003e: 0.25 inches water column (WC)\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eSwitch Stages\u003c\/strong\u003e: 2-stage\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch4\u003eStandard Information\u003c\/h4\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eBrand\u003c\/strong\u003e: ALLIED AIR\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eManufacturer Part Number\u003c\/strong\u003e: 14T67\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"ALLIED AIR","offers":[{"title":"Default Title","offer_id":51284041007410,"sku":"14T67","price":46.98,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0270\/4519\/9983\/files\/309277551.png?v=1781066941","url":"https:\/\/voomisupply.com\/products\/allied-air-14t67-combustion-air-pressure-switch-2-stage","provider":"Voomi Supply","version":"1.0","type":"link"}