mars hydro ifresh 4'' inline duct fan, 205 cfm quiet ec motor grow tent ventilation exhaust fan with speed controller for grow room cooling?booster?indoor gardening ?hydroponics knob controller 4" is up for auction in Home & Kitchen. The current bid is $2.00, 98% below the $85.49 MSRP, in Good Condition. Bid on this item at our Dayton - Edwin C. Moses Blvd. location before the auction closes.