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Just replace the existing screen and 12-volt fan with the high-velocity three-speed Vortex II fan kit to turn your roof vent into a powerful ventilation system. Enjoy over 300% more air movement over standard roof vents Quiet operation with three forward speeds and two reverse. 9" fan blade. Easy installation with only a screwdriver. Universal fit for Ventline, Jensen, Heng’s and Elixir powered vents. White polymer construction.