{"product_id":"concentric-ducting-reducer-enlarger-rigid-ducting-part","title":"Concentric Ducting Reducer\/Enlarger Rigid Ducting Part","description":"```html\n\u003csection class=\"gh-product-listing\"\u003e\n\n\u003ch2\u003eConcentric Ducting Reducer\/Enlarger — Connect Different Duct Sizes Without the Bodge\u003c\/h2\u003e\n\n\u003cp\u003e\u003cstrong\u003eBest for:\u003c\/strong\u003e Growers with mismatched extraction equipment or tight vent spaces who need a quick, reliable adapter\u003c\/p\u003e\n\n\u003cdiv class=\"gh-our-thoughts\" role=\"note\" aria-label=\"Our thoughts\"\u003e\n\u003cp\u003e\u003cem\u003e\u003cstrong\u003eOur thoughts\u003c\/strong\u003e\u003cbr\u003e\nThis is one of those small parts that saves a lot of hassle. We've used these to tidy up mixed-size duct runs without introducing rattles or awkward improvisation. Fit it the right way round, seal it properly, and airflow stays smooth without unnecessary noise. Worth having in the toolkit.\u003c\/em\u003e\u003c\/p\u003e\n\u003c\/div\u003e\n\n\u003cp\u003eA \u003cstrong\u003econcentric duct reducer\u003c\/strong\u003e is a rigid, cone-shaped metal connector that lets you join ducting or equipment with \u003cstrong\u003edifferent diameter sizes\u003c\/strong\u003e in a single, clean transition. Use it as a reducer to step down from a larger duct to a smaller one, or flip it round to enlarge a duct run where space or equipment requires it. Built from lightweight pressed steel, it's tough, reusable, and designed to integrate cleanly into ventilation and extraction systems without creating unnecessary resistance or noise.\u003c\/p\u003e\n\n\u003ch3\u003eHow it compares\u003c\/h3\u003e\n\u003cp\u003eThis sits firmly in the \u003cstrong\u003eessential airflow connector\u003c\/strong\u003e category for any extraction setup.\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003eAllows smooth transitions between different duct sizes — far better than forcing mismatched parts together\u003c\/li\u003e\n\u003cli\u003eRigid pressed steel construction for a secure, stable fit that won't rattle or shift\u003c\/li\u003e\n\u003cli\u003eReusable and hardwearing — survives multiple system changes without degrading\u003c\/li\u003e\n\u003cli\u003eConcentric design (centre line directly aligned) maintains better airflow than eccentric alternatives in most grow room applications\u003c\/li\u003e\n\u003cli\u003eWorks with both rigid and flexible ducting when properly sealed\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003eIn short, it's the proper way to connect mismatched sizes rather than bodging it with tape and wishful thinking.\u003c\/p\u003e\n\n\u003ch3\u003eUsage guidance\u003c\/h3\u003e\n\n\u003cp\u003e\u003cstrong\u003eInstallation basics\u003c\/strong\u003e\u003cbr\u003e\nConnect the reducer to ducting or equipment using either a female-to-female coupling (for rigid ducting runs) or duct clamps and foil tape for flexible connections. For maximum security, use self-drilling screws or duct sealant alongside clamps.\u003c\/p\u003e\n\n\u003cp\u003e\u003cstrong\u003eDirection matters\u003c\/strong\u003e\u003cbr\u003e\nOrient the reducer in the direction that best suits your airflow path. Generally, install it after a fan if you're stepping down to smaller ducting, or use it as an enlarger to reduce resistance and noise on the exit side of your system. Stepping down immediately after a fan can increase noise and reduce efficiency — only do this when absolutely necessary.\u003c\/p\u003e\n\n\u003cp\u003e\u003cstrong\u003eSealing is critical\u003c\/strong\u003e\u003cbr\u003e\nAll connection points need to be airtight. Use duct tape, clamps, or sealant to prevent air bypass and vibration. Loose connections will introduce rattles and undermine extraction performance.\u003c\/p\u003e\n\n\u003cp\u003e\u003cstrong\u003eSystem compatibility\u003c\/strong\u003e\u003cbr\u003e\nWorks with inline fans, carbon filters, air-cooled reflectors, and standard extraction ducting. Size your reducer to match the equipment you're connecting — a 6\" to 4\" reducer, for example, bridges a 6-inch fan or filter to 4-inch ducting or vent space.\u003c\/p\u003e\n\n\u003ch3\u003eTechnical specifications\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003eConstruction: \u003cstrong\u003eLightweight pressed steel\u003c\/strong\u003e\n\u003c\/li\u003e\n\u003cli\u003eDesign: \u003cstrong\u003eConcentric (cone-shaped, centre line aligned)\u003c\/strong\u003e\n\u003c\/li\u003e\n\u003cli\u003eAvailable sizes: \u003cstrong\u003e6\"-4\" (150mm-100mm), 6\"-5\" (150mm-125mm), 8\"-6\" (200mm-150mm), 10\"-8\" (250mm-200mm), 12\"-10\" (315mm-250mm)\u003c\/strong\u003e\n\u003c\/li\u003e\n\u003cli\u003eFunction: \u003cstrong\u003eReducer or enlarger (orientation dependent)\u003c\/strong\u003e\n\u003c\/li\u003e\n\u003cli\u003eConnection method: \u003cstrong\u003eFemale-to-female coupling (rigid), duct clamps or tape (flexible)\u003c\/strong\u003e\n\u003c\/li\u003e\n\u003cli\u003eInstallation: \u003cstrong\u003eDuct sealant, self-drilling screws, duct tape, or hose clamps\u003c\/strong\u003e\n\u003c\/li\u003e\n\u003cli\u003eDurability: \u003cstrong\u003eReusable, hardwearing, no moving parts\u003c\/strong\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eWho this is for\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003eGrowers with extraction equipment that doesn't quite match their ducting diameter\u003c\/li\u003e\n\u003cli\u003eAnyone who's recently upgraded a fan or filter and wants to keep existing ducting in use\u003c\/li\u003e\n\u003cli\u003eSetups with tight vent spaces where smaller diameter ducting is the only option\u003c\/li\u003e\n\u003cli\u003eBuilders of multi-stage extraction runs where different components have different diameters\u003c\/li\u003e\n\u003cli\u003eExperienced growers optimising airflow and noise — using an enlarger on the exit side reduces resistance and noise at the system discharge point\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003eEssentially: anyone tired of improvising around incompatible duct sizes.\u003c\/p\u003e\n\n\u003ch3\u003eOur take\u003c\/h3\u003e\n\u003cp\u003eThis is a practical, no-nonsense connector that does exactly one job and does it well. No moving parts, no fuss, no false economy. Pressed steel, tough as anything, and it'll outlast the ducting it connects.\u003c\/p\u003e\n\n\u003cp\u003eIf your extraction system has different duct sizes or you've changed equipment and now face a diameter mismatch, this is worth picking up. Cheap insurance against bodges that create noise, vibration, or reduced airflow. Keep one in the spares kit — you'll use it eventually.\u003c\/p\u003e\n\n\u003c\/section\u003e\n```","brand":"METAL DUCTING","offers":[{"title":"5\" to 4\" (125mm to 100mm)","offer_id":47916624052394,"sku":"85112","price":7.99,"currency_code":"GBP","in_stock":false},{"title":"6\" to 4\" (150mm to 100mm)","offer_id":47916624085162,"sku":"85122","price":5.99,"currency_code":"GBP","in_stock":true},{"title":"6\" to 5\" (150mm to 125mm)","offer_id":47916624117930,"sku":"85132","price":5.99,"currency_code":"GBP","in_stock":true},{"title":"8\" to 6\" (200mm to 150mm)","offer_id":47916624150698,"sku":"85162","price":11.99,"currency_code":"GBP","in_stock":true},{"title":"10\" to 6\" (250mm to 150mm)","offer_id":47916624183466,"sku":"85082","price":12.99,"currency_code":"GBP","in_stock":false},{"title":"10\" to 8\" (250mm to 200mm)","offer_id":47916624216234,"sku":"85092","price":7.99,"currency_code":"GBP","in_stock":true},{"title":"12\" to 8\" (315mm to 200mm)","offer_id":47916624249002,"sku":"85103","price":14.99,"currency_code":"GBP","in_stock":false},{"title":"14\" to 12\" (355mm to 315mm)","offer_id":47916624281770,"sku":"85104","price":19.99,"currency_code":"GBP","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0053\/5540\/5400\/files\/main_16_4ccd8bea-79ec-4b70-a08c-9ce39c0b937e.jpg?v=1769197561","url":"https:\/\/growershouse.co.uk\/products\/concentric-ducting-reducer-enlarger-rigid-ducting-part","provider":"Growers House ","version":"1.0","type":"link"}