howeall super quiet register booster fan for 4" x 12" register holes, smart register vent with dual intelligent thermostat and wifi app control, heating cooling ac vent fan (orb) 4" x 12" oil rubbed bronze is up for auction in Home & Kitchen. The current bid is $15.00, 72% below the $53.00 MSRP, in New/Like New condition. This auction has ended — similar items appear in live auctions regularly.