{"product_id":"systemair-k-ac-inline-duct-fan","title":"Systemair K AC Inline Duct Fan – Grow Tent Extractor Fan","description":"\u003ch2\u003eDependable AC Extraction in an Airtight Steel Duct Fan\u003c\/h2\u003e\u003cp\u003eThe \u003cstrong\u003eSystemair K AC\u003c\/strong\u003e is the AC-motor version of Systemair's K circular duct fan, sold in the UK by G.A.S. (Global Air Supplies) as the \u003cstrong\u003eK Fan AC\u003c\/strong\u003e. It pairs a \u003cstrong\u003ebackward-curved radial impeller\u003c\/strong\u003e with an external-rotor AC motor inside a sealed \u003cstrong\u003egalvanised steel casing\u003c\/strong\u003e, so stale, odour-laden air stays in the duct and goes out through the carbon filter instead of seeping from the fan body. The XL and L models put a bigger motor into the same duct size for more airflow, and every model is \u003cstrong\u003espeed-controllable\u003c\/strong\u003e with an ordinary AC fan controller — a simple, hard-wearing choice for grow tent and grow room extraction.\u003c\/p\u003e\u003ch3\u003eKey Benefits\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eSealed, airtight casing\u003c\/strong\u003e — galvanised steel, air-tightness class C to EN 1751, so odours cannot leak from the fan body\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e180 to 1,340 m³\/h\u003c\/strong\u003e across the range, from the 4\" (100mm) M to the 12\" (315mm) M, with the XL models moving \u003cstrong\u003e285 m³\/h\u003c\/strong\u003e on 4\", \u003cstrong\u003e359 m³\/h\u003c\/strong\u003e on 5\" and \u003cstrong\u003e724 m³\/h\u003c\/strong\u003e on 6\" duct, and the L models \u003cstrong\u003e965 m³\/h\u003c\/strong\u003e on 8\" and \u003cstrong\u003e979 m³\/h\u003c\/strong\u003e on 10\"\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eSpeed control\u003c\/strong\u003e with a triac or voltage (stepless) controller or a 5-step regulator\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eBuilt-in motor protection\u003c\/strong\u003e against overheating\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eSuits humid rooms\u003c\/strong\u003e — IP55 terminal box and a casing approved for indoor or outdoor installation\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eMounts in any position\u003c\/strong\u003e with the supplied bracket and 25mm spigots made for fast clamps\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eMaintenance-free\u003c\/strong\u003e, with a \u003cstrong\u003e2-year warranty\u003c\/strong\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003eIs Your Tent Too Hot, Too Humid or Leaking Odour?\u003c\/h3\u003e\u003cp\u003eLights add heat and plants add moisture, so a grow tent without steady extraction soon runs hot and humid — conditions that slow growth and invite mould and mildew. Good extraction also holds the tent at a slight \u003cstrong\u003enegative pressure\u003c\/strong\u003e, so fresh air is drawn in through the vents and everything leaving goes out through the carbon filter for proper \u003cstrong\u003eodour control\u003c\/strong\u003e. The K AC's airtight body means the air you are pulling through the filter does not escape from the fan casing on the way, and pairing it with a thermostatic speed controller lets it run slower and quieter when the tent is cool and faster as the \u003cstrong\u003etemperature\u003c\/strong\u003e and \u003cstrong\u003ehumidity\u003c\/strong\u003e climb, keeping \u003cstrong\u003eairflow\u003c\/strong\u003e matched to what the space needs.\u003c\/p\u003e\u003ch3\u003eHow to Use\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eSize it to your space:\u003c\/strong\u003e multiply length × width × height in metres, then × 60 for one complete air change a minute, and add 25–50% for the carbon filter and ducting. A 1.2 × 1.2 × 2 m tent comes out at about 215–260 m³\/h, which the 4\" (100mm) XL covers at 285 m³\/h.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eMount it:\u003c\/strong\u003e fix the bracket inside or outside the tent; the fan runs in any orientation, with the airflow arrow on the label pointing away from the carbon filter.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eConnect the ducting:\u003c\/strong\u003e push the ducting or carbon filter onto the 25mm spigots and secure each joint with a fast clamp.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003ePower it:\u003c\/strong\u003e the fan is pre-wired with an IEC connector — use a UK kettle lead (IEC C13), sold separately, straight to the mains or through a fan speed controller.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eControl it:\u003c\/strong\u003e set the speed with a triac or voltage AC controller, or use a thermostatic model so the fan follows the tent temperature.\u003c\/li\u003e\n\u003c\/ul\u003e\u003cdiv class=\"hcs-specs\"\u003e\n\u003ch3\u003eTechnical Specifications\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eDuct size:\u003c\/strong\u003e 100mm, 125mm, 150mm, 200mm, 250mm or 315mm\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eAirflow:\u003c\/strong\u003e 180–1,340 m³\/h\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eBrand:\u003c\/strong\u003e Systemair (sold in the UK by G.A.S. as the K Fan AC)\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eType:\u003c\/strong\u003e AC circular inline duct fan with backward-curved radial impeller\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eAirflow, 4\" (100mm) M:\u003c\/strong\u003e 180 m³\/h maximum\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eAirflow, 4\" (100mm) XL:\u003c\/strong\u003e 285 m³\/h maximum\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eAirflow, 5\" (125mm) M:\u003c\/strong\u003e 187 m³\/h maximum\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eAirflow, 5\" (125mm) XL:\u003c\/strong\u003e 359 m³\/h maximum\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eAirflow, 6\" (150mm) M:\u003c\/strong\u003e 464 m³\/h maximum\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eAirflow, 6\" (150mm) XL:\u003c\/strong\u003e 724 m³\/h maximum\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eAirflow, 8\" (200mm) M:\u003c\/strong\u003e 760 m³\/h maximum\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eAirflow, 8\" (200mm) L:\u003c\/strong\u003e 965 m³\/h maximum\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eAirflow, 10\" (250mm) M:\u003c\/strong\u003e 788 m³\/h maximum\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eAirflow, 10\" (250mm) L:\u003c\/strong\u003e 979 m³\/h maximum\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eAirflow, 12\" (315mm) M:\u003c\/strong\u003e 1,340 m³\/h maximum\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eMotor:\u003c\/strong\u003e AC external-rotor motor\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eSupply:\u003c\/strong\u003e 230 V single phase, 50\/60 Hz\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eSpeed control:\u003c\/strong\u003e triac or voltage (stepless) controller, or 5-step regulator\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eMotor protection:\u003c\/strong\u003e integrated thermal protection with manual reset; impedance-protected motor on the 4\" (100mm) and 5\" (125mm)\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eEnclosure:\u003c\/strong\u003e IP44 motor, IP55 terminal box\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eCasing:\u003c\/strong\u003e galvanised sheet steel, corrosion class C3, air-tightness class C (EN 1751)\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eImpeller:\u003c\/strong\u003e backward-curved, glass-fibre-reinforced polyamide, dynamically balanced\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003ePower connection:\u003c\/strong\u003e IEC connector; UK mains lead not included\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eInstallation:\u003c\/strong\u003e any position, indoors or outdoors; mounting bracket included; 25mm spigots for fast clamps\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWarranty:\u003c\/strong\u003e 2 years\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/div\u003e\u003ch3\u003eFrequently Asked Questions\u003c\/h3\u003e\u003cdiv class=\"hcs-faq\"\u003e\n\u003cdetails style=\"border:1px solid #e6e6e6;border-radius:8px;padding:12px 16px;margin:0 0 8px;\"\u003e\u003csummary style=\"cursor:pointer;font-weight:600;\"\u003eWhat do the M, XL and L letters mean?\u003c\/summary\u003e\u003cp style=\"margin:10px 0 0;\"\u003eThey are Systemair's output classes for a given duct size. The XL (on 4\", 5\" and 6\" duct) carries a larger motor and impeller than the standard M, and the L (on 8\" and 10\" duct) a more powerful motor, so both move more air through the same ducting.\u003c\/p\u003e\u003c\/details\u003e\u003cdetails style=\"border:1px solid #e6e6e6;border-radius:8px;padding:12px 16px;margin:0 0 8px;\"\u003e\u003csummary style=\"cursor:pointer;font-weight:600;\"\u003eCan I control its speed?\u003c\/summary\u003e\u003cp style=\"margin:10px 0 0;\"\u003eYes. It works with the triac and voltage (stepless) controllers made for AC fans, or a 5-step regulator. A thermostatic controller will raise and lower the speed with the tent temperature.\u003c\/p\u003e\u003c\/details\u003e\u003cdetails style=\"border:1px solid #e6e6e6;border-radius:8px;padding:12px 16px;margin:0 0 8px;\"\u003e\u003csummary style=\"cursor:pointer;font-weight:600;\"\u003eDoes it come with a plug?\u003c\/summary\u003e\u003cp style=\"margin:10px 0 0;\"\u003eIt is pre-wired with an IEC connector rather than a UK plug, so you need a UK kettle lead (IEC C13) to power it, sold separately.\u003c\/p\u003e\u003c\/details\u003e\u003cdetails style=\"border:1px solid #e6e6e6;border-radius:8px;padding:12px 16px;margin:0 0 8px;\"\u003e\u003csummary style=\"cursor:pointer;font-weight:600;\"\u003eShould I choose the AC or the EC version?\u003c\/summary\u003e\u003cp style=\"margin:10px 0 0;\"\u003eSystemair also build the K with an EC motor (the K EC), which uses less electricity and is controlled by a 0–10 V EC controller. The AC version costs less to buy and runs on the simple AC speed controllers many growers already own.\u003c\/p\u003e\u003c\/details\u003e\u003cdetails style=\"border:1px solid #e6e6e6;border-radius:8px;padding:12px 16px;margin:0 0 8px;\"\u003e\u003csummary style=\"cursor:pointer;font-weight:600;\"\u003eCan it run in a humid grow room?\u003c\/summary\u003e\u003cp style=\"margin:10px 0 0;\"\u003eYes. G.A.S. rate the K AC as suitable for ventilating humid rooms, the terminal box is IP55, and Systemair approve the K for indoor or outdoor installation.\u003c\/p\u003e\u003c\/details\u003e\n\u003c\/div\u003e\u003ch3\u003eWorks Well With\u003c\/h3\u003e\u003cdiv class=\"hcs-related\" style=\"display:flex;flex-wrap:wrap;gap:10px;margin:12px 0 0;\"\u003e\n\u003ca href=\"\/products\/kettle-lead-with-uk-plug\" style=\"flex:1 1 240px;display:flex;align-items:center;gap:12px;padding:10px 12px;border:1px solid #e6e6e6;border-radius:8px;text-decoration:none;color:inherit;background:#fff;\"\u003e\u003cimg src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0748\/7127\/5786\/files\/kettle-lead-with-uk-plug.webp?v=1787262443\u0026amp;width=160\" alt=\"Kettle Lead with UK Plug\" width=\"64\" height=\"64\" loading=\"lazy\" style=\"width:64px;height:64px;object-fit:contain;flex:none;\"\u003e\u003cspan style=\"font-size:14px;line-height:1.4;\"\u003e\u003cstrong style=\"display:block;\"\u003eKettle Lead with UK Plug\u003c\/strong\u003e\u003cspan style=\"color:#008d37;\"\u003eThe mains lead the fan needs\u003c\/span\u003e\u003c\/span\u003e\u003c\/a\u003e\u003ca href=\"\/products\/smscom-65a-single-fan-speed-controller\" style=\"flex:1 1 240px;display:flex;align-items:center;gap:12px;padding:10px 12px;border:1px solid #e6e6e6;border-radius:8px;text-decoration:none;color:inherit;background:#fff;\"\u003e\u003cimg src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0748\/7127\/5786\/files\/SMSCom-6.0A-Single-Fan-Speed-Controller-medium_landscape.jpg?v=1746904732\u0026amp;width=160\" alt=\"SMSCom 6.5A Single Fan Speed Controller\" width=\"64\" height=\"64\" loading=\"lazy\" style=\"width:64px;height:64px;object-fit:contain;flex:none;\"\u003e\u003cspan style=\"font-size:14px;line-height:1.4;\"\u003e\u003cstrong style=\"display:block;\"\u003eSMSCom 6.5A Single Fan Speed Controller\u003c\/strong\u003e\u003cspan style=\"color:#008d37;\"\u003eThermostatic speed control for an AC fan\u003c\/span\u003e\u003c\/span\u003e\u003c\/a\u003e\u003ca href=\"\/products\/rhino-pro-carbon-filters\" style=\"flex:1 1 240px;display:flex;align-items:center;gap:12px;padding:10px 12px;border:1px solid #e6e6e6;border-radius:8px;text-decoration:none;color:inherit;background:#fff;\"\u003e\u003cimg src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0748\/7127\/5786\/files\/rhino-pro-6-inch--carbon-filter-150x600mm-medium_landscape.jpg?v=1746904107\u0026amp;width=160\" alt=\"Rhino Pro Carbon Filter\" width=\"64\" height=\"64\" loading=\"lazy\" style=\"width:64px;height:64px;object-fit:contain;flex:none;\"\u003e\u003cspan style=\"font-size:14px;line-height:1.4;\"\u003e\u003cstrong style=\"display:block;\"\u003eRhino Pro Carbon Filter\u003c\/strong\u003e\u003cspan style=\"color:#008d37;\"\u003eOdour control on the fan's intake\u003c\/span\u003e\u003c\/span\u003e\u003c\/a\u003e\u003ca href=\"\/products\/fast-clamps-4-12\" style=\"flex:1 1 240px;display:flex;align-items:center;gap:12px;padding:10px 12px;border:1px solid #e6e6e6;border-radius:8px;text-decoration:none;color:inherit;background:#fff;\"\u003e\u003cimg src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0748\/7127\/5786\/files\/Fast-clamps-group-medium_landscape.jpg?v=1746904795\u0026amp;width=160\" alt=\"Padded Fast Clamps\" width=\"64\" height=\"64\" loading=\"lazy\" style=\"width:64px;height:64px;object-fit:contain;flex:none;\"\u003e\u003cspan style=\"font-size:14px;line-height:1.4;\"\u003e\u003cstrong style=\"display:block;\"\u003ePadded Fast Clamps\u003c\/strong\u003e\u003cspan style=\"color:#008d37;\"\u003eSecures ducting onto each spigot\u003c\/span\u003e\u003c\/span\u003e\u003c\/a\u003e\n\u003c\/div\u003e","brand":"Systemair","offers":[{"title":"4\" (100mm) M - 180m3\/h","offer_id":53929952149770,"sku":"ENV-SYST-005-01","price":91.95,"currency_code":"GBP","in_stock":true},{"title":"4\" (100mm) XL - 285m3\/h","offer_id":53929952182538,"sku":"ENV-SYST-005-02","price":104.99,"currency_code":"GBP","in_stock":true},{"title":"5\" (125mm) M - 187m3\/h","offer_id":53929952215306,"sku":"ENV-SYST-005-03","price":93.95,"currency_code":"GBP","in_stock":true},{"title":"5\" (125mm) XL - 359m3\/h","offer_id":53929952248074,"sku":"ENV-SYST-005-04","price":104.99,"currency_code":"GBP","in_stock":true},{"title":"6\" (150mm) M - 464m3\/h","offer_id":53929952280842,"sku":"ENV-SYST-005-05","price":104.99,"currency_code":"GBP","in_stock":true},{"title":"6\" (150mm) XL - 724m3\/h","offer_id":53929952313610,"sku":"ENV-SYST-005-06","price":123.99,"currency_code":"GBP","in_stock":true},{"title":"8\" (200mm) M - 760m3\/h","offer_id":53929952346378,"sku":"ENV-SYST-005-07","price":125.99,"currency_code":"GBP","in_stock":true},{"title":"8\" (200mm) L - 965m3\/h","offer_id":53929952379146,"sku":"ENV-SYST-005-08","price":153.99,"currency_code":"GBP","in_stock":true},{"title":"10\" (250mm) M - 788m3\/h","offer_id":53929952411914,"sku":"ENV-SYST-005-09","price":127.99,"currency_code":"GBP","in_stock":true},{"title":"10\" (250mm) L - 979m3\/h","offer_id":53929952444682,"sku":"ENV-SYST-005-10","price":153.99,"currency_code":"GBP","in_stock":true},{"title":"12\" (315mm) M - 1340m3\/h","offer_id":53929952477450,"sku":"ENV-SYST-005-11","price":206.99,"currency_code":"GBP","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0748\/7127\/5786\/files\/systemair-k-ac-inline-duct-fan-4-100mm-m-180m3-h-1.jpg?v=1792263026","url":"https:\/\/hydrocropshop.co.uk\/products\/systemair-k-ac-inline-duct-fan","provider":"Hydro Crop Shop","version":"1.0","type":"link"}