{"product_id":"filter-king-37-5x18x1-air-filter-4-pack-merv-8-pleated-filters","title":"Filter King 37.5x18x1 Air Filter 4-Pack - MERV 8 Pleated Filters","description":"\u003cp\u003eIn this review the Filter King 37.5x18x1 Air Filter 4-Pack is evaluated for homeowners who need a dependable, easy-to-install replacement for common A\/C and furnace slots. The bottom line: this set is best for people who want a balance of particle capture and airflow without frequent fuss, because the \u003cstrong\u003eMERV 8\u003c\/strong\u003e pleated media traps more airborne debris while maintaining circulation and can last up to 90 days in typical residential use.\u003c\/p\u003e\u003ch2\u003eKey Features\u003c\/h2\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eMERV 8 rating:\u003c\/strong\u003e Provides effective capture of dust, pollen and pet dander while preserving steady airflow for HVAC systems.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eActual size:\u003c\/strong\u003e The nominal 37.5 in x 18 in x 1 in fits applications where the true filter thickness is 0.75 in, reducing fit surprises at replacement.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eMade in USA:\u003c\/strong\u003e Fully manufactured in the United States with traceable EPA establishment information for buyers who prefer domestic production.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003ePleated design:\u003c\/strong\u003e The pleats increase surface area so the filter traps more particles and extends the filter life between changes.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eLong service window:\u003c\/strong\u003e Rated for up to 90 days of use depending on home conditions, with a recommended 30-90 day replacement interval for 1 in filters.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eQuick installation:\u003c\/strong\u003e Simple open, slide and close installation makes swapping filters a fast maintenance task.\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch2\u003eWho It's For\u003c\/h2\u003e\u003cp\u003eThis pack is aimed at homeowners and renters with standard HVAC return grills or furnace slots sized for 37.5 in x 18 in filters who want consistent air quality improvement without the higher cost and airflow restriction of higher MERV filters. It is a sensible choice for homes with pets, seasonal pollen, or moderate dust.\u003c\/p\u003e\u003cp\u003ePeople who require medical-grade filtration, extremely high allergen control, or custom nonstandard sizes should look elsewhere; likewise, those needing filters thicker than 1 in for specialized HVAC systems will want a different product.\u003c\/p\u003e\u003ch2\u003ePros \u0026amp; Cons\u003c\/h2\u003e\u003cp\u003e\u003cstrong\u003ePros\u003c\/strong\u003e\u003c\/p\u003e\u003cul\u003e\n\u003cli\u003eGood balance of filtration and airflow thanks to the \u003cstrong\u003eMERV 8\u003c\/strong\u003e pleated media.\u003c\/li\u003e\n\u003cli\u003eFour filters per pack offer convenient multi-month replacements for an average household.\u003c\/li\u003e\n\u003cli\u003eActual dimensions are clearly stated to help ensure a correct fit.\u003c\/li\u003e\n\u003cli\u003eMade in the USA, which may matter to buyers prioritizing domestic manufacturing.\u003c\/li\u003e\n\u003c\/ul\u003e\u003cp\u003e\u003cstrong\u003eCons\u003c\/strong\u003e\u003c\/p\u003e\u003cul\u003e\n\u003cli\u003eTrue thickness is 0.75 in rather than a full 1 in, so verification of slot clearance is recommended.\u003c\/li\u003e\n\u003cli\u003eNot intended for applications needing higher than MERV 8 filtration.\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch2\u003eSpecifications\u003c\/h2\u003e\u003ctable\u003e\n\u003ctr\u003e\n\u003ctd\u003eBrand\u003c\/td\u003e\n\u003ctd\u003eFilter King\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eNominal size\u003c\/td\u003e\n\u003ctd\u003e37.5 in x 18 in x 1 in\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eActual size\u003c\/td\u003e\n\u003ctd\u003e37.5 in x 18 in x 0.75 in\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eMERV rating\u003c\/td\u003e\n\u003ctd\u003e8\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003ePack quantity\u003c\/td\u003e\n\u003ctd\u003e4 filters\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eOrigin\u003c\/td\u003e\n\u003ctd\u003eMade in USA (EPA Establishment 103501-FL-1)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eRecommended replacement\u003c\/td\u003e\n\u003ctd\u003eEvery 30-90 days\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/table\u003e\u003ch2\u003eOur Verdict\u003c\/h2\u003e\u003cp\u003eThe Filter King 37.5x18x1 4-Pack is a practical, good-value option for typical homes that need reliable \u003cstrong\u003eMERV 8\u003c\/strong\u003e filtration and straightforward installation. It gives solid particle capture without excessive airflow restriction and includes four filters to cover regular maintenance intervals, making it a convenient choice for most residential HVAC systems.\u003c\/p\u003e\u003ch2\u003eFrequently Asked Questions\u003c\/h2\u003e\u003cp\u003e\u003cstrong\u003eWill these filters fit a standard 37.5 in x 18 in slot?\u003c\/strong\u003e\u003cbr\u003eYes, the nominal dimensions match that size, but note the actual thickness is 0.75 in so confirm slot clearance before purchase.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eHow often should these filters be replaced?\u003c\/strong\u003e\u003cbr\u003eFilter King recommends changing 1 in filters every 30-90 days depending on home conditions; these can last up to 90 days in lower-dust environments.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eAre these filters manufactured in the United States?\u003c\/strong\u003e\u003cbr\u003eYes, they are fully manufactured in the USA and include an EPA establishment number for traceability.\u003c\/p\u003e","brand":"Filter King","offers":[{"title":"Default Title","offer_id":48203392516315,"sku":"B0CPT8XXJR","price":81.68,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0724\/1043\/1707\/files\/717BcMUKewL._AC_SL1500.jpg?v=1770369163","url":"https:\/\/gearmusthave.com\/products\/filter-king-37-5x18x1-air-filter-4-pack-merv-8-pleated-filters","provider":"GearMustHave","version":"1.0","type":"link"}