{"product_id":"oem-lennox-high-altitude-pressure-switch-kit-18l33","title":"OEM Lennox High Altitude Pressure Switch Kit — 18L33","description":"\u003cp\u003eThe \u003cstrong\u003eLennox 18L33\u003c\/strong\u003e is an OEM-genuine High Altitude Pressure Switch Kit specifically calibrated for Lennox furnaces installed at high elevations, where standard pressure switch settings may not accurately reflect safe operating conditions. It plays a critical safety role by sensing inducer motor draft pressure and preventing ignition if unsafe conditions are detected. If your Lennox furnace is failing to heat, locking out on pressure faults, or cycling off prematurely at altitude, the \u003cstrong\u003e18L33\u003c\/strong\u003e kit is the correct factory-spec replacement to restore dependable operation.\u003c\/p\u003e","brand":"Lennox","offers":[{"title":"Default Title","offer_id":63081035301235,"sku":"LNX-18L33","price":24.95,"currency_code":"USD","in_stock":true}],"url":"https:\/\/nationalhvacparts.com\/products\/oem-lennox-high-altitude-pressure-switch-kit-18l33","provider":"National HVAC Parts","version":"1.0","type":"link"}