{"product_id":"oem-lennox-heat-exchanger-33m15","title":"OEM Lennox Heat Exchanger — 33M15","description":"\u003cp\u003eThe genuine OEM Lennox \u003cstrong\u003e33M15\u003c\/strong\u003e heat exchanger is the heart of your Lennox gas furnace, transferring heat from the combustion process to the air circulating through your home while keeping toxic flue gases fully separated from the airstream. Precision-formed to Lennox specifications, this direct factory replacement restores safe, efficient heating performance to your system.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eCommon failure symptoms:\u003c\/strong\u003e A compromised \u003cstrong\u003e33M15\u003c\/strong\u003e heat exchanger may show visible cracks, rust, or corrosion, produce flame rollout or flickering burner flames, or trigger repeated limit-switch lockouts. Cracks can allow carbon monoxide to leak into the supply air, so a failed heat exchanger is a serious safety concern that warrants immediate replacement.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhy OEM matters:\u003c\/strong\u003e Heat exchangers are engineered to the exact metallurgy, dimensions, and temperature tolerances of your specific Lennox furnace. Aftermarket substitutes may not seal correctly, dissipate heat properly, or withstand thermal cycling, risking both efficiency and safety. Installing the genuine Lennox \u003cstrong\u003e33M15\u003c\/strong\u003e guarantees a precise fit, correct heat transfer, and the safety integrity your Lennox equipment demands.\u003c\/p\u003e","brand":"Lennox","offers":[{"title":"Default Title","offer_id":63081108734323,"sku":"LNX-33M15","price":399.95,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0984\/1190\/5395\/files\/nhvac-heat-exchanger-LNX-33M15.jpg?v=1783761899","url":"https:\/\/nationalhvacparts.com\/products\/oem-lennox-heat-exchanger-33m15","provider":"National HVAC Parts","version":"1.0","type":"link"}