dewenwils register booster fan, 4" x 10" register holes, 180 adjustable grille vent fan booster, improves heating & cooling vents, quiet 140 cfm, panel & remote control for room, floor, wall, white white 4" x 10" is up for auction in Tools & Home Improvement. The current bid is $6.00, 84% below the $36.99 MSRP, in Good Condition. Bid on this item at our Amelia - Ohio Pike location before the auction closes.