{"product_id":"oem-lennox-high-altitude-pressure-switch-kit-18l35","title":"OEM Lennox High Altitude Pressure Switch Kit — 18L35","description":"\u003cp\u003eThe \u003cstrong\u003eLennox 18L35\u003c\/strong\u003e is a factory-original High Altitude Pressure Switch Kit designed to keep Lennox furnaces operating safely and efficiently in high-altitude environments where lower atmospheric pressure affects combustion air dynamics. The switch confirms proper negative pressure from the inducer motor before the control board initiates the ignition sequence. A faulty \u003cstrong\u003e18L35\u003c\/strong\u003e can cause your Lennox furnace to lock out, short-cycle, or display a pressure fault — replacing it with this OEM kit restores proper function.\u003c\/p\u003e","brand":"Lennox","offers":[{"title":"Default Title","offer_id":63081035235699,"sku":"LNX-18L35","price":24.95,"currency_code":"USD","in_stock":true}],"url":"https:\/\/nationalhvacparts.com\/products\/oem-lennox-high-altitude-pressure-switch-kit-18l35","provider":"National HVAC Parts","version":"1.0","type":"link"}