{"product_id":"hvac-filter-18x21x1","title":"HVAC FILTER 18X21X1","description":"High-efficiency HVAC filter designed to fit standard 18x21x1 inch return air ducts. Captures dust, pollen, pet dander, and airborne particles to maintain clean indoor air and protect your heating and cooling system. Easy to install and replace. Check your system's specifications before purchasing to ensure proper fit and compatibility.","brand":"A\u0026A Mechanical Group LLC","offers":[{"title":"Default Title","offer_id":46780728344732,"sku":null,"price":6.37,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0741\/1928\/2844\/files\/ChatGPTImageApr29_2026_09_27_38AM_114b8d8f-a6cc-4ed4-b708-401a52bd4bce.png?v=1777474124","url":"https:\/\/aamechanicalgroup.com\/products\/hvac-filter-18x21x1","provider":"A\u0026A Mechanical Group LLC","version":"1.0","type":"link"}