{"product_id":"21-1-8x30-3-4x1-exact-ez-flow-basic-merv-4-filters-12-pack","title":"21-1\/8x30-3\/4x1 Exact Filters Fiberglass MERV 1-4 (12 pack)","description":"\u003cp\u003eThis 21-1\/8 x 30-3\/4 x 1″ Exact Filters® air filter is manufactured to your exact dimensions, eliminating the guesswork of matching an off-the-shelf filter to a non-standard 21-1\/8 x 30-3\/4 x 1″ opening.\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\u003eA MERV 1-4 fiberglass filter is the baseline option for HVAC protection: it stops the larger debris that would foul your coil and blower wheel, at the lowest possible airflow restriction. If your priority is maximum airflow and long blower life, and you're comfortable with frequent replacement, this is the rating that loads your system the least.\u003c\/p\u003e\n\n\u003cp\u003e\u003cstrong\u003eSpecifications\u003c\/strong\u003e\u003c\/p\u003e\n\n\u003cul\u003e\n  \u003cli\u003eNominal size: 21-1\/8 x 30-3\/4 x 1″\u003c\/li\u003e\n  \u003cli\u003eActual dimensions: 21-1\/8 x 30-3\/4 x 3\/4″\u003c\/li\u003e\n  \u003cli\u003eEfficiency rating: MERV 1-4\u003c\/li\u003e\n  \u003cli\u003eQuantity: 12 filters per carton\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003cp\u003eThe 21-1\/8 x 30-3\/4 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 21-1\/8 x 30-3\/4 x 1″ specification — no trimming or taping required at installation\u003c\/li\u003e\n  \u003cli\u003eCardboard frame with reinforced media for structural stability during handling and installation\u003c\/li\u003e\n  \u003cli\u003eSuitable for forced-air furnaces, central AC, heat pumps, and packaged HVAC systems\u003c\/li\u003e\n  \u003cli\u003ePleated construction (or fiberglass, depending on MERV tier) designed for balanced capture and airflow\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 21-1\/8 x 30-3\/4 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\/21-1-8x30-3-4x1-exact-pleated-merv-8-filters-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 21-1\/8 x 30-3\/4 x 1″ filter in MERV 8\" title=\"See the 21-1\/8 x 30-3\/4 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\/21-1-8x30-3-4x1-exact-pleated-merv-11-filters-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 21-1\/8 x 30-3\/4 x 1″ filter in MERV 11\" title=\"See the 21-1\/8 x 30-3\/4 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\u003ctd style=\"width:33.3333%;vertical-align:top;padding:0;\"\u003e\u003ca href=\"\/products\/21-1-8x30-3-4x1-exact-pleated-merv-13-filters-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 21-1\/8 x 30-3\/4 x 1″ filter in MERV 13\" title=\"See the 21-1\/8 x 30-3\/4 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 21-1\/8 x 30-3\/4 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":44083983122554,"sku":"10055D01799 21 1\/8 x 30 3\/4 x 1 E","price":464.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/1130\/9462\/files\/ExactM1_1268x1134_b827b231-5396-455b-a2df-e070b138d3ff.jpg?v=1749318494","url":"https:\/\/www.rememberthefilter.com\/products\/21-1-8x30-3-4x1-exact-ez-flow-basic-merv-4-filters-12-pack","provider":"RememberTheFilter.com","version":"1.0","type":"link"}