{"product_id":"general-filters-fuel-oil-filter-cartridge-1a-25b-10-micron-wool-felt-3-8-npt-biofuel-gaskets","title":"General Filters fuel oil filter cartridge 1A-25B — 10-micron wool-felt, 3\/8\" NPT, biofuel gaskets","description":"\u003cp\u003e\u003cstrong\u003eThe General Filters 1A-25B replacement cartridge is a UL-listed wool-felt fuel oil filter designed for final filtration in residential and light commercial oil-fired heating systems.\u003c\/strong\u003e\u003c\/p\u003e\n\n\u003cp\u003eThis replacement element fits systems that use a 3\/8\" NPT connection and is built to handle a 12 P.S.I. working pressure and up to a 10 gallons-per-hour firing rate with #2 fuel oil. Constructed with 10-micron wool felt media, it removes fine particulate from the distribution line to protect burners and improve reliability. The cartridge is compatible with single- or two-pipe installations and is now supplied with gaskets rated for use with biofuel blends.\u003c\/p\u003e\n\n\u003ch3\u003eHow does this cartridge protect my burner and fuel system?\u003c\/h3\u003e\n\u003cp\u003eThe wool felt media captures small solid contaminants that can clog nozzles or damage pump parts, reducing maintenance frequency and keeping combustion components operating cleanly. Being a final-stage filter, it traps particles that upstream filters might miss.\u003c\/p\u003e\n\u003cul\u003e\n  \u003cli\u003e10-micron wool felt filtration removes fine particulates.\u003c\/li\u003e\n  \u003cli\u003e41 sq. in. felt surface and 11.5 cu. in. felt volume for extended capacity.\u003c\/li\u003e\n  \u003cli\u003eUL listing affirms safety and performance standards.\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eWill it fit my existing oil line and what are the physical specs?\u003c\/h3\u003e\n\u003cp\u003eThis cartridge uses a standard 3\/8\" NPT inlet\/outlet commonly found on small residential and light commercial fuel systems. Its compact footprint makes retrofits straightforward without significant plumbing changes.\u003c\/p\u003e\n\u003cul\u003e\n  \u003cli\u003eConnection: 3\/8\" NPT standard thread.\u003c\/li\u003e\n  \u003cli\u003eUnit size: 5-1\/8\" high × 3-5\/8\" diameter for tight installations.\u003c\/li\u003e\n  \u003cli\u003eOperating pressure rated to 12 P.S.I., suitable for typical distribution systems.\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eHow much fuel flow can it handle and how does that affect system performance?\u003c\/h3\u003e\n\u003cp\u003eThe cartridge supports a firing rate of up to 10 gallons per hour on #2 fuel oil, matching the demands of many small-to-medium burners. Proper sizing ensures steady flow with minimal pressure drop while maintaining filtration efficiency.\u003c\/p\u003e\n\u003cul\u003e\n  \u003cli\u003eFiring rate: 10 GPH on #2 fuel oil for typical residential burners.\u003c\/li\u003e\n  \u003cli\u003eDesigned as a final filter to minimize pressure fluctuation under normal loads.\u003c\/li\u003e\n  \u003cli\u003eWorks well in both one- and two-pipe fuel configurations.\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eAre the materials compatible with modern fuel blends, like biodiesel blends?\u003c\/h3\u003e\n\u003cp\u003eThe replacement elements are supplied with gaskets compatible with biofuel blends, reducing the risk of seal degradation when using modern fuel formulations. The wool felt media is a proven material for trapping contaminants without chemically reacting with standard fuel oils.\u003c\/p\u003e\n\u003cul\u003e\n  \u003cli\u003eNow sold with biofuel-compatible gaskets for broader fuel compatibility.\u003c\/li\u003e\n  \u003cli\u003eWool felt media provides mechanical filtration without chemical additives.\u003c\/li\u003e\n  \u003cli\u003eUL listing indicates tested performance across expected operating conditions.\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003cp\u003eWho this is for: The General Filters 1A-25B cartridge is aimed at homeowners, HVAC technicians, and facility managers who service small to average-sized residential or commercial oil-fired heating systems. Choose this replacement when you need a compact, UL-listed final filter element with 10-micron wool felt media, standard 3\/8\" NPT fittings, and capacity to handle up to 10 GPH while remaining compatible with modern biofuel blends.\u003c\/p\u003e\n\u003csection class=\"product-faq-snippet\"\u003e\u003ch3\u003eFAQ\u003c\/h3\u003e\n\u003cdiv class=\"faq-item\"\u003e\n\u003cp class=\"faq-q\"\u003eQ: What size connection does the 1A-25B cartridge use?\u003c\/p\u003e\n\u003cp class=\"faq-a\"\u003eA: It uses a standard 3\/8\" NPT connection compatible with common residential oil line fittings.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"faq-item\"\u003e\n\u003cp class=\"faq-q\"\u003eQ: How fine is the filter media and what flow rate can it support?\u003c\/p\u003e\n\u003cp class=\"faq-a\"\u003eA: The media is 10-micron wool felt and supports up to 10 gallons per hour on #2 fuel oil.\u003c\/p\u003e\n\u003c\/div\u003e\u003c\/section\u003e","brand":"General Filters","offers":[{"title":"Default Title","offer_id":48086802727070,"sku":"B0052V1HW2","price":58.89,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0781\/2041\/9486\/files\/general-filters-1a-25b-front-view.jpg?v=1785905699","url":"https:\/\/northtrailauto.ca\/products\/general-filters-fuel-oil-filter-cartridge-1a-25b-10-micron-wool-felt-3-8-npt-biofuel-gaskets","provider":"North Trail Auto","version":"1.0","type":"link"}