{"product_id":"tjernlund-products-ef-12","title":"Tjernlund Products EF-12 Duct Fan","description":"\u003cp\u003eThe \u003cstrong\u003eTjernlund Products EF-12 Duct Fan\u003c\/strong\u003e is a heavy-duty \u003cstrong\u003e12-inch inline booster fan\u003c\/strong\u003e engineered for professional HVAC applications where airflow velocity is critical. Built with a 24-gauge \u003cstrong\u003egalvanized steel housing\u003c\/strong\u003e, this axial fan is specifically designed to overcome static pressure in long duct runs, delivering a free air rating of \u003cstrong\u003e875 CFM\u003c\/strong\u003e. It features a 1\/35 HP shaded pole motor operating at 1500 RPM, optimized for maintaining air movement in both \u003cstrong\u003e12\" flex duct\u003c\/strong\u003e and rigid metal systems.\u003c\/p\u003e\n\n\u003cp\u003eAs a veteran-grade \u003cstrong\u003eHVAC duct booster\u003c\/strong\u003e, the EF-12 includes an \u003cstrong\u003eexternal junction box\u003c\/strong\u003e for straightforward field wiring and a ribbed duct stop to ensure secure seating during installation. Whether you are addressing \"dead zones\" in a residential trunk line or configuring \u003cstrong\u003ecommercial ventilation exhaust\u003c\/strong\u003e for a warehouse or lunchroom, this unit handles airstream temperatures up to 150°F. For automated operation, contractors typically pair this model with a PS1503 Duct Airstat, which activates the \u003cstrong\u003ebooster fan\u003c\/strong\u003e based on pressure changes within the system.\u003c\/p\u003e\n\n\u003cstrong\u003eKey Benefits\u003c\/strong\u003e\n\u003cul\u003e\n  \u003cli\u003e\n\u003cstrong\u003eMaximum Airflow:\u003c\/strong\u003e Delivers \u003cstrong\u003e875 CFM free air\u003c\/strong\u003e and maintains 800 CFM through 25 feet of straight ducting to resolve temperature imbalances.\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eRugged Construction:\u003c\/strong\u003e Features a 24-gauge \u003cstrong\u003egalvanized steel\u003c\/strong\u003e housing with a crimped leading edge for professional-grade durability.\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eVersatile Application:\u003c\/strong\u003e Ideal for \u003cstrong\u003educt air supply\u003c\/strong\u003e, bathroom exhaust, or spot ventilation in pole barns and fume control systems.\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eInstallation Ease:\u003c\/strong\u003e Engineered with built-in duct stops for quick integration into \u003cstrong\u003e12-inch flexible or metal ductwork\u003c\/strong\u003e.\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003cstrong\u003eCommon Questions\u003c\/strong\u003e\n\u003cp\u003e\u003cstrong\u003eIs the EF-12 compatible with variable speed controllers?\u003c\/strong\u003e\u003cbr\u003e\nYes, this unit can be manually managed using a standard ON\/OFF switch or a compatible electronic speed controller to fine-tune \u003cstrong\u003eCFM output\u003c\/strong\u003e based on specific site requirements.\u003c\/p\u003e\n\n\u003cp\u003e\u003cstrong\u003eCan this fan be used for high-temperature exhaust?\u003c\/strong\u003e\u003cbr\u003e\nThe EF-12 is rated for a maximum inlet temperature of 150°F, making it suitable for standard forced air systems, but it should not be used in grease hoods or high-heat industrial flues.\u003c\/p\u003e\n\n\u003cp\u003e\u003cstrong\u003eDoes this unit start automatically when the furnace turns on?\u003c\/strong\u003e\u003cbr\u003e\nThis is a standard model without an internal sensor. For automatic synchronization with the primary air handler, the use of a pressure-sensing \u003cstrong\u003educt airstat\u003c\/strong\u003e is required.\u003c\/p\u003e\n\n\u003cp\u003e\u003cstrong style=\"color: red;\"\u003eThis item is not eligible for free shipping.\u003c\/strong\u003e\u003c\/p\u003e\n\n\u003cp\u003eDisclaimer: While we strive for 100% accuracy, product data and specifications are subject to change. Please contact our team to confirm compatibility or technical details before purchasing.\u003c\/p\u003e","brand":"Tjernlund Products","offers":[{"title":"Default Title","offer_id":43465314599090,"sku":"EF-12","price":228.13,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/1838\/2375\/files\/Pic_da70f2cd-9e17-45c0-96a4-02bd24b30cfc.png?v=1701815801","url":"https:\/\/www.gsistore.com\/products\/tjernlund-products-ef-12","provider":"GSIstore","version":"1.0","type":"link"}