Designed for 3/4" Thick Hardwood Flooring PROUDLY MADE IN THE U.S.A. Overall size is 9" x 15" 30% More Air Flow Measurements are HVAC Hole Size Our vents are PROUDLY MADE IN THE U.S.A. Crystal Lake Illinois to be exact. The flush mount vents are designed to sit flush with ¾” thick hardwood flooring. Our Hi-Flow vents provide 30% more airflow than standard wooden vents. The vent insert sits in a rebated frame, which is grooved on all 4 sides. While it’s easier to install at time of installation of the floor, these can be retrofitted into existing floors. Vents are not designed to support weight.