{"product_id":"systemair-k-ec-inline-duct-fan","title":"Systemair K EC Inline Duct Fan – Grow Room Extractor Fan","description":"\u003ch2\u003eQuiet, Efficient EC Extraction in an Airtight Steel Duct Fan\u003c\/h2\u003e\u003cp\u003eThe \u003cstrong\u003eSystemair K EC\u003c\/strong\u003e is the EC-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 EC\u003c\/strong\u003e. A \u003cstrong\u003ebackward-curved radial impeller\u003c\/strong\u003e on a high-efficiency external-rotor \u003cstrong\u003eEC motor\u003c\/strong\u003e moves from \u003cstrong\u003e321 m³\/h\u003c\/strong\u003e on the 4\" (100mm) model up to \u003cstrong\u003e1,734 m³\/h\u003c\/strong\u003e on the 12\" (315mm) L, all inside an \u003cstrong\u003eairtight galvanised steel casing\u003c\/strong\u003e that keeps stale, odour-laden air in the duct until it has passed through your carbon filter. Its speed is set by a 0–10 V signal from a G.A.S. digital EC controller, and seven sizes cover everything from a single grow tent to a full grow room.\u003c\/p\u003e\u003ch3\u003eKey Benefits\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eEC motor with 0–10 V speed control\u003c\/strong\u003e — runs smoothly at low speed with no motor hum, so it can tick over quietly when the room is settled\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eOver 50% lower running cost\u003c\/strong\u003e than the equivalent K AC fan, according to G.A.S.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e321 to 1,734 m³\/h\u003c\/strong\u003e across seven models for \u003cstrong\u003e4\" (100mm)\u003c\/strong\u003e to \u003cstrong\u003e12\" (315mm)\u003c\/strong\u003e ducting\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eAirtight galvanised steel casing\u003c\/strong\u003e — air-tightness class C to EN 1751 and corrosion class C3, for leak-free extraction through a carbon filter\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eBuilt-in electronic protection\u003c\/strong\u003e — thermal and locked-rotor protection with a soft start\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eFits in any position\u003c\/strong\u003e, indoors or out, using the supplied mounting bracket and 25mm spigots made for fast clamps\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eMaintenance-free\u003c\/strong\u003e running, backed by a \u003cstrong\u003e2-year warranty\u003c\/strong\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003eHeat, Humidity and Noise in the Grow Room\u003c\/h3\u003e\u003cp\u003eGrow lights pour heat into a tent or room and plants release moisture all day through transpiration. If stale air is not cleared fast enough the temperature climbs, \u003cstrong\u003ehumidity\u003c\/strong\u003e builds and the risk of mould and mildew rises; run an extractor flat out instead and you pay for the electricity and live with the noise. An AC fan slowed by a basic voltage controller can hum and lose torque at low settings. The K EC changes speed electronically, so it can run gently through lights-off and ramp up the moment heat or humidity rises, keeping \u003cstrong\u003eairflow\u003c\/strong\u003e steady and the space at the slight \u003cstrong\u003enegative pressure\u003c\/strong\u003e that draws every bit of exhaust air through the carbon filter for reliable \u003cstrong\u003eodour control\u003c\/strong\u003e.\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) model covers.\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 so it stays airtight.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003ePower it:\u003c\/strong\u003e the fan is pre-wired with an IEC connector — power it with a UK kettle lead (IEC C13), sold separately.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eControl it:\u003c\/strong\u003e link the fan to a G.A.S. digital EC controller with a G.A.S. Pack 8 active EC cable to set the speed by hand or let the controller follow the room 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 321–1,734 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 EC)\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eType:\u003c\/strong\u003e EC circular inline duct fan with backward-curved radial impeller\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eAirflow, 4\" (100mm):\u003c\/strong\u003e 321 m³\/h maximum\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eAirflow, 5\" (125mm):\u003c\/strong\u003e 482 m³\/h maximum\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eAirflow, 6\" (150mm):\u003c\/strong\u003e 598 m³\/h maximum\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eAirflow, 8\" (200mm):\u003c\/strong\u003e 774 m³\/h maximum\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eAirflow, 10\" (250mm):\u003c\/strong\u003e 1,033 m³\/h maximum\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eAirflow, 12\" (315mm) M:\u003c\/strong\u003e 1,415 m³\/h maximum\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eAirflow, 12\" (315mm) L:\u003c\/strong\u003e 1,734 m³\/h maximum\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eMotor:\u003c\/strong\u003e EC external-rotor motor with integrated control electronics\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eSpeed control:\u003c\/strong\u003e 0–10 V signal from a G.A.S. digital EC controller (Pack 8 active EC cable)\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eSupply:\u003c\/strong\u003e 220–240 V single phase, 50\/60 Hz\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eMotor protection:\u003c\/strong\u003e integrated electronic thermal protection, locked-rotor protection and soft start\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;\"\u003eCan I use an ordinary AC fan speed controller with the K EC?\u003c\/summary\u003e\u003cp style=\"margin:10px 0 0;\"\u003eNo. The K EC takes its speed from a 0–10 V control signal, so it needs an EC controller such as the G.A.S. digital EC range, linked with a G.A.S. Pack 8 active EC cable. A triac or voltage controller made for AC fans cannot control it and should not be wired into its supply.\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;\"\u003eWhich size do I need for my tent?\u003c\/summary\u003e\u003cp style=\"margin:10px 0 0;\"\u003eWork out the volume in cubic metres, multiply by 60 for one air change a minute and add 25–50% for the carbon filter and ducting. A 1.2 × 1.2 × 2 m tent needs roughly 215–260 m³\/h, within the 4\" (100mm) model's 321 m³\/h; a 2.4 × 1.2 × 2 m tent needs roughly 430–520 m³\/h, which suits the 6\" (150mm) at 598 m³\/h.\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;\"\u003eWhat is the difference between the 12\" M and L?\u003c\/summary\u003e\u003cp style=\"margin:10px 0 0;\"\u003eBoth fit 315mm (12\") ducting. The L is the higher-output model at 1,734 m³\/h against the M's 1,415 m³\/h, for large rooms, long duct runs or big carbon filters.\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;\"\u003eWill I get the full rated airflow?\u003c\/summary\u003e\u003cp style=\"margin:10px 0 0;\"\u003eThe figures are maximum free-air ratings. A carbon filter, long duct runs and bends all add resistance, so real airflow is lower — which is why the sizing rule above adds headroom.\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\/gas-digital-ec-cable-pack-8-5m-active-male-to-male\" 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\/gas-digital-ec-cable-pack-8-5m-active-male-to-male-1.png?v=1789237214\u0026amp;width=160\" alt=\"G.A.S Digital EC Cable Pack 8\" 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;\"\u003eG.A.S Digital EC Cable Pack 8\u003c\/strong\u003e\u003cspan style=\"color:#008d37;\"\u003eLinks the fan to a G.A.S. EC controller\u003c\/span\u003e\u003c\/span\u003e\u003c\/a\u003e\u003ca href=\"\/products\/global-air-ec-digital-fan-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\/fan-controller-global-air-ec-digital-fan-controller-29227828674744.webp?v=1773498635\u0026amp;width=160\" alt=\"Global Air EC Digital Fan 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;\"\u003eGlobal Air EC Digital Fan Controller\u003c\/strong\u003e\u003cspan style=\"color:#008d37;\"\u003eThermostatic speed control for Systemair EC fans\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\n\u003c\/div\u003e","brand":"Systemair","offers":[{"title":"4\" (100mm) - 321m3\/h","offer_id":53929952510218,"sku":"ENV-SYST-006-01","price":216.99,"currency_code":"GBP","in_stock":true},{"title":"5\" (125mm) - 482m3\/h","offer_id":53929952542986,"sku":"ENV-SYST-006-02","price":221.99,"currency_code":"GBP","in_stock":true},{"title":"6\" (150mm) - 598m3\/h","offer_id":53929952575754,"sku":"ENV-SYST-006-03","price":230.99,"currency_code":"GBP","in_stock":true},{"title":"8\" (200mm) - 774m3\/h","offer_id":53929952608522,"sku":"ENV-SYST-006-04","price":243.99,"currency_code":"GBP","in_stock":true},{"title":"10\" (250mm) - 1033m3\/h","offer_id":53929952641290,"sku":"ENV-SYST-006-05","price":327.99,"currency_code":"GBP","in_stock":true},{"title":"12\" M (315mm) - 1415m3\/h","offer_id":53929952674058,"sku":"ENV-SYST-006-06","price":469.99,"currency_code":"GBP","in_stock":true},{"title":"12\" L (315mm) - 1734m3\/h","offer_id":53929952706826,"sku":"ENV-SYST-006-07","price":622.99,"currency_code":"GBP","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0748\/7127\/5786\/files\/systemair-k-ec-inline-duct-fan-4-100mm-321m3-h-1.jpg?v=1792263028","url":"https:\/\/hydrocropshop.co.uk\/products\/systemair-k-ec-inline-duct-fan","provider":"Hydro Crop Shop","version":"1.0","type":"link"}