vanshinieer register booster fan for 4" x 10" register holes, quiet 10-speed ac vent fan with remote & thermostat control, improves heating&cooling, auto-adjustable louver, usb powered for floor wall ceiling white is up for auction in Tools & Home Improvement. The current bid is $1.00, 97% below the $39.99 MSRP, in Good Condition. This auction has ended — similar items appear in live auctions regularly.