{"product_id":"aluminum-white-linear-slot-diffuser-12x4-duct-opening-modern-air-vent-cover","title":"Aluminum White Linear Slot Diffuser 12x4 (Duct Opening)- Modern Air Vent Cover","description":"\u003cp\u003e⚠️ \u003cstrong\u003eCHECK SIZE BEFORE PURCHASE:\u003c\/strong\u003e This 12x4 linear slot diffuser fits a \u003cstrong\u003e12\" × 4\" duct opening\u003c\/strong\u003e (the hole in your wall, ceiling, or floor — not your old cover face).\u003cbr\u003e\u003cstrong\u003eNeck size:\u003c\/strong\u003e 11-3\/4\" × 3-3\/4\". \u003cstrong\u003eOverall face size:\u003c\/strong\u003e 13-3\/4\" × 5-3\/4\". \u003ca href=\"#gv-sizing-guide\"\u003eSee the full 12x4 sizing guide →\u003c\/a\u003e\u003c\/p\u003e\n\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eFits a 12\" × 4\" duct opening\u003c\/strong\u003e — measure the hole, not your old cover face.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eDrop-in surface-mount replacement\u003c\/strong\u003e — no drywall, flooring, or duct modification required.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eModern minimalist slot design\u003c\/strong\u003e for contemporary interiors and cleaner visual lines.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eSolid alloy aluminum\u003c\/strong\u003e — rust-resistant, durable, and zero plastic parts.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWall, ceiling, or low-traffic floor compatible\u003c\/strong\u003e — one diffuser, multiple install scenarios.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eMulti-directional adjustable airflow\u003c\/strong\u003e — direct air left, right, both ways, or fully closed.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eTÜV Rheinland tested\u003c\/strong\u003e — lead-free coating, phthalate-free materials, Prop 65 compliant, and corrosion-resistant finish.\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch2\u003eDesigned for modern interiors, engineered for comfort\u003c\/h2\u003e\n\u003cp\u003eSwap an old 12\" × 4\" stamped-steel register for a cleaner aluminum diffuser with adjustable, multi-directional airflow. This white surface-mount diffuser installs on walls, ceilings, and low-traffic floors, giving existing duct openings a cleaner, more intentional finish. White finish pairs naturally with white trim, light ceilings, painted walls, Scandinavian interiors, and light wood floors. \u003c\/p\u003e\n\n\u003ch2\u003eDesigned to upgrade, not to remodel\u003c\/h2\u003e\n\u003cp\u003eThis is a replacement-first diffuser, not a construction-only vent. It is designed to sit over an existing opening and deliver a cleaner finish with less visual clutter than a traditional grille.\u003c\/p\u003e\n\u003cp\u003eInside: heavy-gauge aluminum, a multi-directional adjustable blade system, and a powder-coated finish made for everyday residential use. Outside: a clean slot profile that looks more refined than a bulky stamped grille.\u003c\/p\u003e\n\n\u003ch2 id=\"gv-sizing-guide\"\u003eSizing Guide — Will a 12x4 fit your space?\u003c\/h2\u003e\n\u003cp\u003e\u003cstrong\u003eIMPORTANT:\u003c\/strong\u003e Measure the hole in your wall, ceiling, or floor — do not measure your old vent cover.\u003c\/p\u003e\n\u003cp\u003eThis 12x4 aluminum vent cover is designed to fit a standard 12\" × 4\" duct opening (also listed as a 4x12 wall register or 4 x 12 vent cover).\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eDuct opening size:\u003c\/strong\u003e 12\" × 4\" (this is what you measure)\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eNeck size:\u003c\/strong\u003e 11-3\/4\" × 3-3\/4\"\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eOverall face size:\u003c\/strong\u003e 13-3\/4\" × 5-3\/4\"\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eDesign note:\u003c\/strong\u003e Like all linear slot diffusers, this model has a narrower face panel than many traditional louvered grilles to achieve a cleaner, minimal aesthetic. It may not fully conceal the unpainted area left by an old AC vent cover — a light paint touch-up may be needed for a perfectly finished look.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003e\u003cstrong\u003eQuick check:\u003c\/strong\u003e\u003c\/p\u003e\n\u003col\u003e\n\u003cli\u003eRemove your existing vent cover.\u003c\/li\u003e\n\u003cli\u003eMeasure the \u003cem\u003eopening\u003c\/em\u003e in the wall, ceiling, or floor — not the old cover.\u003c\/li\u003e\n\u003cli\u003eIf the opening is approximately 12\" × 4\", this 12x4 linear slot diffuser fits.\u003c\/li\u003e\n\u003c\/ol\u003e\n\n\u003ch2\u003eDesigned for modern homes\u003c\/h2\u003e\n\u003cp\u003eThe 12x4 size fits long narrow openings in hallways, bedrooms, living rooms, and ceiling runs where a standard grille can look too busy. The linear face turns that opening into a cleaner architectural detail while keeping the installation straightforward.\u003c\/p\u003e\n\u003ch3\u003eOn the wall\u003c\/h3\u003e\n\u003cp\u003eReplaces dated stamped-steel grilles in hallways, bedrooms, living rooms, and long ceiling or wall runs. The clean slot line helps the HVAC opening blend into the room instead of becoming a visual distraction.\u003c\/p\u003e\n\u003ch3\u003eOn the ceiling\u003c\/h3\u003e\n\u003cp\u003eCreates a low-profile look for finished ceilings, modern condos, kitchens, bathrooms, and basements. Use the included screws for a secure wall or ceiling installation.\u003c\/p\u003e\n\u003ch3\u003eOn the floor\u003c\/h3\u003e\n\u003cp\u003eWorks in low-traffic floor areas where a modern register-style look is preferred. For busy walkways or heavy foot traffic, choose a heavier-duty floor register.\u003c\/p\u003e\n\n\u003ch2\u003ePremium Features\u003c\/h2\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eNo-plastic construction:\u003c\/strong\u003e Aluminum construction gives the diffuser a more premium feel than plastic covers and helps prevent cracking or yellowing.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eModern surface-mount design:\u003c\/strong\u003e The face sits cleanly over the duct opening, making it ideal for retrofit projects and design upgrades.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eComfort-focused airflow:\u003c\/strong\u003e The adjustable blade system helps distribute conditioned air more evenly across the room.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eReusable and removable:\u003c\/strong\u003e The unit can be removed for cleaning, painting, maintenance, or future room updates.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eTested Safe for Your Home:\u003c\/strong\u003e Independently tested by TÜV Rheinland across 4 safety standards — lead-free surface coating, phthalate-free materials, free of PBT toxic chemicals, and corrosion-resistant finish per ASTM B117 salt spray standard.\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch2\u003e5-Minute Retrofit Installation\u003c\/h2\u003e\n\u003cp\u003eDesigned as a direct replacement for standard 12\" × 4\" duct openings with no structural modification required.\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eOn Walls \u0026amp; Ceilings:\u003c\/strong\u003e Mounts with the included screws through pre-drilled hidden side holes. Only a screwdriver and the included adjustment tool are needed.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eOn Floors:\u003c\/strong\u003e Drop the cover into the existing opening in low-traffic areas. Optional screws may be used for extra hold.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eFully Removable:\u003c\/strong\u003e The diffuser can be removed for cleaning, painting, maintenance, or future room updates.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003e\u003ciframe loading=\"lazy\" title=\"Installation guide — Green Vent 12x4 aluminum linear slot diffuser\" src=\"https:\/\/www.youtube.com\/embed\/2NETJ1EgEis\" height=\"315\" width=\"560\"\u003e\u003c\/iframe\u003e\u003c\/p\u003e\n\n\u003ch2\u003eTechnical Specifications\u003c\/h2\u003e\n\u003ctable\u003e\n\u003cthead\u003e\n\u003ctr\u003e\n\u003cth\u003eFeature\u003c\/th\u003e\n\u003cth\u003eSpecification\u003c\/th\u003e\n\u003c\/tr\u003e\n\u003c\/thead\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eManufacturer\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eGreen Vent\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eProduct Type\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eAluminum Linear Slot Diffuser\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eDuct Opening Size\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e12\" × 4\"\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eNeck Size\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e11-3\/4\" × 3-3\/4\"\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eOverall Face Size\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e13-3\/4\" × 5-3\/4\"\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eColor \/ Finish\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eWhite \/ Powder-coated\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eMaterial\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eAlloy Aluminum\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eShape\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eRectangular\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eInstallation \/ Mounting Type\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eScrew-In for wall\/ceiling; drop-in for low-traffic floor\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eAirflow Direction\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eMulti-directional adjustable: left \/ right \/ both \/ closed\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eCompatibility\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eSupply air, return air, low-traffic floor register use\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eMounting Surfaces\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eWall, ceiling, low-traffic floor\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eCountry of Origin\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eVietnam\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eIncluded Components\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eAdjustable air diffuser bar, Screw\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\n\u003ch2\u003eFrequently Asked Questions\u003c\/h2\u003e\n\u003cp\u003e\u003cstrong\u003e1. What size do I order — 12x4 or face size?\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003eOrder by duct opening size. 12x4 means a 12\" × 4\" duct opening—the hole in your wall, ceiling, or floor. The visible face size of this diffuser is 13-3\/4\" × 5-3\/4\".\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003e2. What is the difference between a linear slot diffuser and a regular vent cover?\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003eA linear slot diffuser moves air through a clean continuous slot instead of a visible louvered face. The result is a more modern look and a smoother airflow pattern for residential supply or return openings.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003e3. Can I install this 12x4 vent cover on a ceiling?\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003eYes. This 12x4 linear slot diffuser can be installed on walls, ceilings, or low-traffic floors as long as the duct opening measures 12\" × 4\". Use the included screws for wall and ceiling installation.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003e4. Does it include an adjustable airflow damper?\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003eYes. The built-in adjustment bar lets you direct airflow left, right, evenly to both sides, or fully close the blades to reduce airflow into unused rooms.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003e5. Can this diffuser be used for both supply and return air?\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003eIt can be used for supply air and many residential return openings. For high-volume returns or filtration needs, choose a dedicated Green Vent air return grille with pre-filter instead.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003e6. Can I use a filter with this linear slot diffuser?\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003eNo. Standard filters should not be placed behind individual vent covers because they can restrict airflow and strain the HVAC system. Use a return grille with a pre-filter if filtration at the vent is required.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003e7. Is the finish paintable?\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003eYes. The powder-coated finish is durable as shipped, but it can be lightly sanded, primed, and painted with standard spray paint for custom color matching.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003e8. Can this be installed outdoors?\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003eYes, in sheltered locations such as covered patios, garages, and enclosed porches. It is not intended for direct rain exposure.\u003c\/p\u003e\n\n\u003ch2\u003eExplore related Green Vent products\u003c\/h2\u003e\n\u003cul\u003e\n\u003cli\u003e\u003ca href=\"https:\/\/www.greenvent.us\/products\/12x4-black-aluminum-linear-slot-diffuser\"\u003e12x4 black aluminum linear slot diffuser\u003c\/a\u003e\u003c\/li\u003e\n\u003cli\u003e\u003ca href=\"https:\/\/www.greenvent.us\/collections\/12x4-vent-covers\"\u003e12x4 vent covers collection\u003c\/a\u003e\u003c\/li\u003e\n\u003cli\u003e\u003ca href=\"https:\/\/www.greenvent.us\/collections\/white-linear-slot-diffusers\"\u003ewhite linear slot diffusers\u003c\/a\u003e\u003c\/li\u003e\n\u003cli\u003e\u003ca href=\"https:\/\/www.greenvent.us\/collections\/linear-slot-diffuser\"\u003elinear slot diffuser collection\u003c\/a\u003e\u003c\/li\u003e\n\u003cli\u003e\u003ca href=\"https:\/\/www.greenvent.us\/collections\/air-vent-covers\"\u003emodern air vent covers\u003c\/a\u003e\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003cp\u003e\u003cstrong\u003eFor multi-room projects, standardize by duct opening size and finish so the vents look consistent across the home.\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cimg loading=\"eager\" alt=\"Green Vent 10x6 aluminum linear slot diffuser in white powder-coated finish, front view\" src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0916\/9138\/5204\/files\/modern-air-vent-cover-lineaer-slot-diffuser-green-vent.jpg?v=1778639719\"\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cimg loading=\"lazy\" alt=\"Side angled view of 10x6 white linear slot diffuser showing extruded aluminum profile and slot depth\" src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0916\/9138\/5204\/files\/modern-air-vent-cover-lineaer-slot-diffuser-green-vent_2.jpg?v=1778639719\"\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cimg loading=\"lazy\" alt=\"10x6 linear slot diffuser installed on white wall in modern living room\" src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0916\/9138\/5204\/files\/modern-air-vent-cover-lineaer-slot-diffuser-green-vent_3.jpg?v=1778639719\"\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cimg loading=\"lazy\" alt=\"10x6 aluminum vent cover mounted on ceiling above contemporary kitchen island\" src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0916\/9138\/5204\/files\/modern-air-vent-cover-lineaer-slot-diffuser-green-vent_4.jpg?v=1778639719\"\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cimg loading=\"lazy\" alt=\"10x6 white vent cover installed flush on hardwood floor near baseboard\" src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0916\/9138\/5204\/files\/modern-air-vent-cover-lineaer-slot-diffuser-green-vent_5.jpg?v=1778639719\"\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cimg loading=\"lazy\" alt=\"Hand measuring 10 inch by 6 inch duct opening with tape measure for sizing reference\" src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0916\/9138\/5204\/files\/modern-air-vent-cover-lineaer-slot-diffuser-green-vent_6.jpg?v=1778639719\"\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cimg loading=\"lazy\" alt=\"Diagram showing duct opening 10 by 6 inches and overall face size 11.75 by 7.75 inches\" src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0916\/9138\/5204\/files\/modern-air-vent-cover-lineaer-slot-diffuser-green-vent_7.jpg?v=1778639719\"\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cimg loading=\"lazy\" alt=\"Step-by-step retrofit installation of 10x6 aluminum linear slot diffuser on drywall\" src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0916\/9138\/5204\/files\/modern-air-vent-cover-lineaer-slot-diffuser-green-vent_8.jpg?v=1778639719\"\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cimg loading=\"lazy\" alt=\"Close-up of multi-directional adjustable airflow blade on 10x6 linear slot diffuser\" src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0916\/9138\/5204\/files\/modern-air-vent-cover-lineaer-slot-diffuser-green-vent_9.jpg?v=1778639719\"\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cimg loading=\"lazy\" alt=\"Hidden side-screw mounting detail on 10x6 white aluminum vent cover\" src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0916\/9138\/5204\/files\/modern-air-vent-cover-lineaer-slot-diffuser-green-vent_10.jpg?v=1778639719\"\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cimg loading=\"lazy\" alt=\"What is in the box - 10x6 linear slot diffuser, mounting screws, and blade adjustment tool\" src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0916\/9138\/5204\/files\/modern-air-vent-cover-lineaer-slot-diffuser-green-vent_11.jpg?v=1778639719\"\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cimg loading=\"lazy\" alt=\"TÜV Rheinland tested certification badge for Green Vent 10x6 aluminum linear slot diffuser\" src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0916\/9138\/5204\/files\/modern-air-vent-cover-lineaer-slot-diffuser-green-vent_12.jpg?v=1778639719\"\u003e\u003c\/p\u003e","brand":"GREEN VENT","offers":[{"title":"Default Title","offer_id":51568631546154,"sku":"GV.DLS.124N","price":38.79,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0990\/7103\/3642\/files\/aluminum-white-linear-slot-diffuser-12x4-modern-air-vent-cover.webp?v=1779393477","url":"https:\/\/equipmentleader.com\/products\/aluminum-white-linear-slot-diffuser-12x4-duct-opening-modern-air-vent-cover","provider":"Equipment Leader","version":"1.0","type":"link"}