Installing a flush-mounted floor register is not as difficult as you might think. This project only takes a few common household tools, such as a power drill and a hammer. Installing the register before the installation of your new 3/4-inch wood flooring generally takes less than 15 minutes.
Use this checklist when you go to the store and purchase your items.
If you are replacing an existing floor register, be sure to choose a new one that fits your existing duct opening. Simply measure the width and length of the duct opening to determine the correct size to purchase.
Position the flush mount frame over the duct opening, allowing even spacing on all four sides.
Drill a 5/64-inch pilot hole inside the recessed area of the frame at an angle down into the subfloor.
Carefully making sure that the frame has not shifted, use a #6 finishing nail to attach the one corner to the subfloor. Use a nail set to drive the finishing nail into the recessed wood in order not to damage the frame with the hammer.
Repeat step 3 so that you have 2 nails per side inside the frame, securing the register to the subfloor.
Cut and fit your 3/4-inch wood flooring flush to all sides of the frame.
Insert vent cover into the frame.