{"title":"28x28x1 Geothermal Compatible HVAC Exact Fit Filters","description":"\u003cp\u003eGeothermal Filters That Actually Fit – Tough MERV 8-13 pleated filters built for WaterFurnace, ClimateMaster, Carrier and more. Stocked in the big, hard-to-find sizes like your 28x28x1 HVAC filters.\u003c\/p\u003e","products":[{"product_id":"28x28x1-geothermal-compatible-hvac-exact-fit-filters-merv-13-12-pack","title":"28x28x1 Geothermal Compatible HVAC Exact Fit Filters – MERV 13 (12 pack)","description":"\u003cp\u003eThis air filter is made to a 28 x 28 x 1″ nominal size for HVAC systems, air handlers, and return grilles that require an exact custom dimension rather than a standard retail size.\u003c\/p\u003e\n\n\u003cp\u003eEven a quarter-inch of gap around a filter can allow a significant percentage of return air to bypass the media entirely, which is why the exact fit matters as much as the filter's efficiency rating.\u003c\/p\u003e\n\n\u003cp\u003eMERV 13 is the top efficiency offered in the Exact Filters® line. It captures the broadest range of airborne particles we make, including fine dust, smoke particles, and the submicron fraction that carries many allergens and bioaerosols. Buildings dealing with wildfire smoke, indoor air-quality concerns, or sensitive occupants commonly step up to this rating.\u003c\/p\u003e\n\n\u003cp\u003e\u003cstrong\u003eSpecifications\u003c\/strong\u003e\u003c\/p\u003e\n\n\u003cul\u003e\n  \u003cli\u003eNominal size: 28 x 28 x 1″\u003c\/li\u003e\n  \u003cli\u003eActual dimensions: 27-3\/4 x 27-3\/4 x 3\/4″\u003c\/li\u003e\n  \u003cli\u003eEfficiency rating: MERV 13\u003c\/li\u003e\n  \u003cli\u003eQuantity: 12 filters per carton\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003cp\u003eCustomers typically order a 28 x 28 x 1″ custom filter because their system is older, was built by a regional manufacturer, was retrofitted, or was framed on-site by an installer who didn't conform to a standard filter dimension. If that describes your situation, you're in the right place.\u003c\/p\u003e\n\n\u003cp\u003e\u003cstrong\u003eFeatures\u003c\/strong\u003e\u003c\/p\u003e\n\u003cul\u003e\n  \u003cli\u003eSuitable for forced-air furnaces, central AC, heat pumps, and packaged HVAC systems\u003c\/li\u003e\n  \u003cli\u003eSold as a 12-pack so you have a full year of replacements on hand\u003c\/li\u003e\n  \u003cli\u003eCardboard frame with reinforced media for structural stability during handling and installation\u003c\/li\u003e\n  \u003cli\u003eOrientation arrow printed on the frame to ensure correct airflow direction at install\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003cp style=\"font-family:Arial,Helvetica,sans-serif;font-size:15px;font-weight:bold;color:#1E2D7D;margin:0 0 12px 0;\"\u003eSame 28 x 28 x 1″ size, different efficiency rating\u003c\/p\u003e\u003ctable width=\"100%\" cellpadding=\"0\" cellspacing=\"8\" style=\"border-collapse:separate;margin:18px 0 0 0;padding:0;\"\u003e\u003ctbody\u003e\u003ctr\u003e\n\u003ctd style=\"width:33.3333%;vertical-align:top;padding:0;\"\u003e\u003ca href=\"\/products\/28x28x1-exact-ez-flow-basic-merv-4-filters-12-pack\" style=\"display:block;background-color:#000000;color:#ffffff;text-decoration:none;padding:14px 12px;border-radius:6px;font-family:Arial,Helvetica,sans-serif;font-weight:bold;font-size:15px;line-height:1.25;text-align:center;box-sizing:border-box;\" aria-label=\"See the 28 x 28 x 1″ filter in MERV 1-4\" title=\"See the 28 x 28 x 1″ filter in MERV 1-4\"\u003eMERV 1-4\u003cspan style=\"display:block;font-weight:normal;font-size:12px;color:#ffffff;opacity:0.9;margin-top:2px;\"\u003eBasic dust-stop\u003c\/span\u003e\u003c\/a\u003e\u003c\/td\u003e\n\u003ctd style=\"width:33.3333%;vertical-align:top;padding:0;\"\u003e\u003ca href=\"\/products\/28x28x1-geothermal-compatible-hvac-exact-fit-filters-merv-8-12-pack\" style=\"display:block;background-color:#007B6B;color:#ffffff;text-decoration:none;padding:14px 12px;border-radius:6px;font-family:Arial,Helvetica,sans-serif;font-weight:bold;font-size:15px;line-height:1.25;text-align:center;box-sizing:border-box;\" aria-label=\"See the 28 x 28 x 1″ filter in MERV 8\" title=\"See the 28 x 28 x 1″ filter in MERV 8\"\u003eMERV 8\u003cspan style=\"display:block;font-weight:normal;font-size:12px;color:#ffffff;opacity:0.9;margin-top:2px;\"\u003eStandard efficiency\u003c\/span\u003e\u003c\/a\u003e\u003c\/td\u003e\n\u003ctd style=\"width:33.3333%;vertical-align:top;padding:0;\"\u003e\u003ca href=\"\/products\/28x28x1-geothermal-compatible-hvac-exact-fit-filters-merv-11-12-pack\" style=\"display:block;background-color:#6B3FA0;color:#ffffff;text-decoration:none;padding:14px 12px;border-radius:6px;font-family:Arial,Helvetica,sans-serif;font-weight:bold;font-size:15px;line-height:1.25;text-align:center;box-sizing:border-box;\" aria-label=\"See the 28 x 28 x 1″ filter in MERV 11\" title=\"See the 28 x 28 x 1″ filter in MERV 11\"\u003eMERV 11\u003cspan style=\"display:block;font-weight:normal;font-size:12px;color:#ffffff;opacity:0.9;margin-top:2px;\"\u003eEnhanced efficiency\u003c\/span\u003e\u003c\/a\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\u003c\/tbody\u003e\u003c\/table\u003e\n\n\u003ctable width=\"100%\" cellpadding=\"0\" cellspacing=\"0\" border=\"0\" style=\"border-collapse:separate;margin:24px 0 0 0;padding:0;\"\u003e\u003ctbody\u003e\u003ctr\u003e\u003ctd style=\"background-color:#1E2D7D;border-radius:8px;padding:22px 24px;vertical-align:top;\"\u003e\n\u003cp style=\"font-family:Arial,Helvetica,sans-serif;font-size:18px;font-weight:bold;color:#ffffff;margin:0 0 8px 0;line-height:1.3;\"\u003eNeed 28 x 28 x 2″ or another depth?\u003c\/p\u003e\n\u003cp style=\"font-family:Arial,Helvetica,sans-serif;font-size:14px;color:#ffffff;margin:0 0 16px 0;line-height:1.55;opacity:0.95;\"\u003eThis size is available in other depths we don't stock online — reach out and our team will quote it for you, typically same business day.\u003c\/p\u003e\n\u003ctable cellpadding=\"0\" cellspacing=\"10\" border=\"0\" style=\"border-collapse:separate;margin:0;padding:0;\"\u003e\u003ctbody\u003e\u003ctr\u003e\n\u003ctd style=\"padding:0;vertical-align:top;\"\u003e\u003ca href=\"tel:+18664698556\" style=\"display:block;background-color:#007B6B;color:#ffffff;text-decoration:none;padding:14px 22px;border-radius:6px;font-family:Arial,Helvetica,sans-serif;font-weight:bold;font-size:16px;line-height:1.2;text-align:center;box-sizing:border-box;white-space:nowrap;\"\u003eCall 866-469-8556\u003c\/a\u003e\u003c\/td\u003e\n\u003ctd style=\"padding:0;vertical-align:top;\"\u003e\u003ca href=\"\/pages\/contact-us\" style=\"display:block;background-color:#ffffff;color:#1E2D7D;text-decoration:none;padding:14px 22px;border-radius:6px;font-family:Arial,Helvetica,sans-serif;font-weight:bold;font-size:16px;line-height:1.2;text-align:center;box-sizing:border-box;white-space:nowrap;\"\u003eContact us for a quote\u003c\/a\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\u003c\/tbody\u003e\u003c\/table\u003e\n\u003c\/td\u003e\u003c\/tr\u003e\u003c\/tbody\u003e\u003c\/table\u003e","brand":"Exact Filters","offers":[{"title":"Default Title","offer_id":44077570588794,"sku":"90013D01799 27 3\/4 x 27 3\/4 x 1 E","price":567.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/1130\/9462\/files\/ExactM13_1400x1400_2a38810e-750f-4bf3-aaf8-1d8df9f69387.jpg?v=1749252723"},{"product_id":"28x28x1-geothermal-compatible-hvac-exact-fit-filters-merv-11-12-pack","title":"28x28x1 Geothermal Compatible HVAC Exact Fit Filters – MERV 11 (12 pack)","description":"\u003cp\u003eWhen your HVAC system calls for a 28 x 28 x 1″ filter and the standard aisle doesn't carry it, this Exact Filters® unit is cut to your exact 28 x 28 x 1″ spec — no shims, no gaps, no bypass air.\u003c\/p\u003e\n\n\u003cp\u003eEven a quarter-inch of gap around a filter can allow a significant percentage of return air to bypass the media entirely, which is why the exact fit matters as much as the filter's efficiency rating.\u003c\/p\u003e\n\n\u003cp\u003eThis MERV 11 pleated filter is engineered for buildings where filtration matters — allergy-prone households, sites with pets, properties near construction or agriculture, light-commercial spaces with elevated particulate loads — but where the HVAC system wasn't originally specified for the higher static pressure of a MERV 13.\u003c\/p\u003e\n\n\u003cp\u003e\u003cstrong\u003eSpecifications\u003c\/strong\u003e\u003c\/p\u003e\n\n\u003cul\u003e\n  \u003cli\u003eNominal size: 28 x 28 x 1″\u003c\/li\u003e\n  \u003cli\u003eActual dimensions: 27-3\/4 x 27-3\/4 x 3\/4″\u003c\/li\u003e\n  \u003cli\u003eEfficiency rating: MERV 11\u003c\/li\u003e\n  \u003cli\u003eQuantity: 12 filters per carton\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003cp\u003eThe 28 x 28 x 1″ dimension is one of the many non-standard sizes we make on demand, serving both retrofit installations in older homes and light-commercial properties where the return housing dates to an older era of HVAC construction.\u003c\/p\u003e\n\n\u003cp\u003e\u003cstrong\u003eFeatures\u003c\/strong\u003e\u003c\/p\u003e\n\u003cul\u003e\n  \u003cli\u003eMade to your exact 28 x 28 x 1″ specification — no trimming or taping required at installation\u003c\/li\u003e\n  \u003cli\u003eSold as a 12-pack so you have a full year of replacements on hand\u003c\/li\u003e\n  \u003cli\u003ePleated construction (or fiberglass, depending on MERV tier) designed for balanced capture and airflow\u003c\/li\u003e\n  \u003cli\u003eCardboard frame with reinforced media for structural stability during handling and installation\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003cp style=\"font-family:Arial,Helvetica,sans-serif;font-size:15px;font-weight:bold;color:#1E2D7D;margin:0 0 12px 0;\"\u003eSame 28 x 28 x 1″ size, different efficiency rating\u003c\/p\u003e\u003ctable width=\"100%\" cellpadding=\"0\" cellspacing=\"8\" style=\"border-collapse:separate;margin:18px 0 0 0;padding:0;\"\u003e\u003ctbody\u003e\u003ctr\u003e\n\u003ctd style=\"width:33.3333%;vertical-align:top;padding:0;\"\u003e\u003ca href=\"\/products\/28x28x1-exact-ez-flow-basic-merv-4-filters-12-pack\" style=\"display:block;background-color:#000000;color:#ffffff;text-decoration:none;padding:14px 12px;border-radius:6px;font-family:Arial,Helvetica,sans-serif;font-weight:bold;font-size:15px;line-height:1.25;text-align:center;box-sizing:border-box;\" aria-label=\"See the 28 x 28 x 1″ filter in MERV 1-4\" title=\"See the 28 x 28 x 1″ filter in MERV 1-4\"\u003eMERV 1-4\u003cspan style=\"display:block;font-weight:normal;font-size:12px;color:#ffffff;opacity:0.9;margin-top:2px;\"\u003eBasic dust-stop\u003c\/span\u003e\u003c\/a\u003e\u003c\/td\u003e\n\u003ctd style=\"width:33.3333%;vertical-align:top;padding:0;\"\u003e\u003ca href=\"\/products\/28x28x1-geothermal-compatible-hvac-exact-fit-filters-merv-8-12-pack\" style=\"display:block;background-color:#007B6B;color:#ffffff;text-decoration:none;padding:14px 12px;border-radius:6px;font-family:Arial,Helvetica,sans-serif;font-weight:bold;font-size:15px;line-height:1.25;text-align:center;box-sizing:border-box;\" aria-label=\"See the 28 x 28 x 1″ filter in MERV 8\" title=\"See the 28 x 28 x 1″ filter in MERV 8\"\u003eMERV 8\u003cspan style=\"display:block;font-weight:normal;font-size:12px;color:#ffffff;opacity:0.9;margin-top:2px;\"\u003eStandard efficiency\u003c\/span\u003e\u003c\/a\u003e\u003c\/td\u003e\n\u003ctd style=\"width:33.3333%;vertical-align:top;padding:0;\"\u003e\u003ca href=\"\/products\/28x28x1-geothermal-compatible-hvac-exact-fit-filters-merv-13-12-pack\" style=\"display:block;background-color:#C8102E;color:#ffffff;text-decoration:none;padding:14px 12px;border-radius:6px;font-family:Arial,Helvetica,sans-serif;font-weight:bold;font-size:15px;line-height:1.25;text-align:center;box-sizing:border-box;\" aria-label=\"See the 28 x 28 x 1″ filter in MERV 13\" title=\"See the 28 x 28 x 1″ filter in MERV 13\"\u003eMERV 13\u003cspan style=\"display:block;font-weight:normal;font-size:12px;color:#ffffff;opacity:0.9;margin-top:2px;\"\u003eHighest efficiency\u003c\/span\u003e\u003c\/a\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\u003c\/tbody\u003e\u003c\/table\u003e\n\n\u003ctable width=\"100%\" cellpadding=\"0\" cellspacing=\"0\" border=\"0\" style=\"border-collapse:separate;margin:24px 0 0 0;padding:0;\"\u003e\u003ctbody\u003e\u003ctr\u003e\u003ctd style=\"background-color:#1E2D7D;border-radius:8px;padding:22px 24px;vertical-align:top;\"\u003e\n\u003cp style=\"font-family:Arial,Helvetica,sans-serif;font-size:18px;font-weight:bold;color:#ffffff;margin:0 0 8px 0;line-height:1.3;\"\u003eNeed 28 x 28 x 2″ or another depth?\u003c\/p\u003e\n\u003cp style=\"font-family:Arial,Helvetica,sans-serif;font-size:14px;color:#ffffff;margin:0 0 16px 0;line-height:1.55;opacity:0.95;\"\u003eThis size is available in other depths we don't stock online — reach out and our team will quote it for you, typically same business day.\u003c\/p\u003e\n\u003ctable cellpadding=\"0\" cellspacing=\"10\" border=\"0\" style=\"border-collapse:separate;margin:0;padding:0;\"\u003e\u003ctbody\u003e\u003ctr\u003e\n\u003ctd style=\"padding:0;vertical-align:top;\"\u003e\u003ca href=\"tel:+18664698556\" style=\"display:block;background-color:#007B6B;color:#ffffff;text-decoration:none;padding:14px 22px;border-radius:6px;font-family:Arial,Helvetica,sans-serif;font-weight:bold;font-size:16px;line-height:1.2;text-align:center;box-sizing:border-box;white-space:nowrap;\"\u003eCall 866-469-8556\u003c\/a\u003e\u003c\/td\u003e\n\u003ctd style=\"padding:0;vertical-align:top;\"\u003e\u003ca href=\"\/pages\/contact-us\" style=\"display:block;background-color:#ffffff;color:#1E2D7D;text-decoration:none;padding:14px 22px;border-radius:6px;font-family:Arial,Helvetica,sans-serif;font-weight:bold;font-size:16px;line-height:1.2;text-align:center;box-sizing:border-box;white-space:nowrap;\"\u003eContact us for a quote\u003c\/a\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\u003c\/tbody\u003e\u003c\/table\u003e\n\u003c\/td\u003e\u003c\/tr\u003e\u003c\/tbody\u003e\u003c\/table\u003e","brand":"Exact Filters","offers":[{"title":"Default Title","offer_id":44077570785402,"sku":"85655D01799 27 3\/4 x 27 3\/4 x 1 E","price":543.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/1130\/9462\/files\/ExactM11_1400x1400_35dba93b-0626-4d51-80d7-805670002086.jpg?v=1749244669"},{"product_id":"28x28x1-geothermal-compatible-hvac-exact-fit-filters-merv-8-12-pack","title":"28x28x1 Geothermal Compatible HVAC Exact Fit Filters – MERV 8 (12 pack)","description":"\u003cp class=\"p1\"\u003eOur \u003cspan class=\"s1\"\u003e\u003cb\u003eGeothermal Compatible HVAC Filters – MERV 8\u003c\/b\u003e\u003c\/span\u003e are designed to provide dependable system protection and consistent airflow for geothermal heat pump systems and high-efficiency HVAC equipment. Built to meet the tighter fit requirements common in geothermal applications from manufacturers such as \u003cspan class=\"s2\"\u003e\u003cb\u003eCarrier\u003c\/b\u003e\u003c\/span\u003e, \u003cspan class=\"s2\"\u003e\u003cb\u003eClimateMaster\u003c\/b\u003e\u003c\/span\u003e, and \u003cspan class=\"s2\"\u003e\u003cb\u003eWaterFurnace\u003c\/b\u003e\u003c\/span\u003e, these filters prioritize proper fit, reduced air bypass, and smooth airflow—key factors for long-running geothermal systems.\u003c\/p\u003e\n\u003cp class=\"p1\"\u003eEach filter is manufactured to \u003cspan class=\"s1\"\u003e\u003cb\u003eexact dimensions\u003c\/b\u003e\u003c\/span\u003e, not undersized nominal measurements. For example, a 28x28x1 filter is produced at an actual size of \u003cspan class=\"s1\"\u003e\u003cb\u003e27-3\/4” x 27-3\/4” x 3\/4”\u003c\/b\u003e\u003c\/span\u003e, ensuring a tight seal within the filter rack. This precise fit helps protect sensitive geothermal components by preventing unfiltered air from bypassing the filter.\u003c\/p\u003e\n\u003cp class=\"p1\"\u003eWith a \u003cspan class=\"s1\"\u003e\u003cb\u003eMERV 8 rating\u003c\/b\u003e\u003c\/span\u003e, these filters efficiently capture larger airborne particles such as household dust, lint, pollen, and debris while maintaining \u003cspan class=\"s1\"\u003e\u003cb\u003elow airflow resistance\u003c\/b\u003e\u003c\/span\u003e. This makes MERV 8 an excellent choice for geothermal heat pumps and water-source systems that prioritize airflow, efficiency, and long service life.\u003c\/p\u003e\n\u003ch3\u003e\u003cb\u003eDesigned for Geothermal \u0026amp; High-Efficiency Systems\u003c\/b\u003e\u003c\/h3\u003e\n\u003cp class=\"p1\"\u003eCompatible with many systems including:\u003c\/p\u003e\n\u003cul\u003e\n\u003cli class=\"p1\"\u003eGeothermal heat pump systems\u003c\/li\u003e\n\u003cli class=\"p1\"\u003eWater-source heat pumps\u003c\/li\u003e\n\u003cli class=\"p1\"\u003eHigh-efficiency residential HVAC systems\u003c\/li\u003e\n\u003cli class=\"p1\"\u003eLight commercial HVAC applications\u003c\/li\u003e\n\u003cli class=\"p1\"\u003eForced-air heating and cooling systems requiring low-resistance filtration\u003c\/li\u003e\n\u003cli class=\"p1\"\u003eCommon geothermal platforms from Carrier, ClimateMaster, and WaterFurnace\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003e\u003cb\u003eKey Features \u0026amp; Benefits\u003c\/b\u003e\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli class=\"p1\"\u003e\n\u003cspan class=\"s1\"\u003e\u003cb\u003eExact Fit Manufacturing\u003c\/b\u003e\u003c\/span\u003e – Built to precise dimensions for improved sealing and reduced air bypass\u003c\/li\u003e\n\u003cli class=\"p1\"\u003e\n\u003cspan class=\"s1\"\u003e\u003cb\u003eMERV 8 Filtration\u003c\/b\u003e\u003c\/span\u003e – Reliable particle capture with minimal impact on airflow\u003c\/li\u003e\n\u003cli class=\"p1\"\u003e\n\u003cspan class=\"s1\"\u003e\u003cb\u003eLow-Resistance Pleated Media\u003c\/b\u003e\u003c\/span\u003e – Ideal for geothermal systems with long or frequent run cycles\u003c\/li\u003e\n\u003cli class=\"p1\"\u003e\n\u003cspan class=\"s1\"\u003e\u003cb\u003eRigid, Durable Frame\u003c\/b\u003e\u003c\/span\u003e – Maintains shape and fit under continuous operation\u003c\/li\u003e\n\u003cli class=\"p1\"\u003e\n\u003cspan class=\"s1\"\u003e\u003cb\u003eSystem-Friendly Performance\u003c\/b\u003e\u003c\/span\u003e – Helps support efficiency and component longevity\u003c\/li\u003e\n\u003cli class=\"p1\"\u003eThese \u003cspan class=\"s1\"\u003e\u003cb\u003egeothermal compatible MERV 8 HVAC filters\u003c\/b\u003e\u003c\/span\u003e are a smart choice for homeowners and facilities using Carrier, ClimateMaster, or WaterFurnace geothermal systems where airflow consistency and system protection are the top priorities.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cblockquote\u003e\n\u003cspan class=\"s1\"\u003e\u003cb\u003eNote:\u003c\/b\u003e\u003c\/span\u003e Always verify your system’s required filter dimensions and recommended filtration level. Exact-fit filters are designed to match real HVAC openings rather than rounded nominal sizes.\u003c\/blockquote\u003e","brand":"Exact Filters","offers":[{"title":"Default Title","offer_id":44079562162298,"sku":null,"price":489.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/1130\/9462\/files\/ExactM8_121af9bf-1e2a-4bcb-9674-ead8a6e5ff87.jpg?v=1749228984"}],"url":"https:\/\/www.rememberthefilter.com\/collections\/28x28x1-geothermal-hvac-filters.oembed","provider":"RememberTheFilter.com","version":"1.0","type":"link"}