How To Measure Floor Vent Size

A register is measured by the size of its louvers which is the bottom of the register that fits into the ventilation duct.

How to measure floor vent size.

Remove the screws that hold the vent in place. Measure the opening in your floor wall or ceiling. Locate the register or grille you are replacing and note if it is for a wall ceiling or floor. Take out the existing floor register and measure the length width of the opening in inches all registers will be listed in inches.

For example a 4 x 10 flush mount wood register has an overall size of 6 x 12. You could also use a 4 x10 floor register if your hole measured 4 1 4 x 10 1 2. For floor registers they follow the same rules as return grilles where you state the dimension parallel to the louvers first. The length l is always expressed first followed by the height h dimension.

If your hole measures 3 7 8 x 9 7 8 you should be able to use a 4 x 10 floor register depending on the style. Length in inches by height in inches this is your duct opening size. Measure the size of the air duct opening. How to measure and replace a floor register.

The flush mount no frame is also ordered by measuring the duct size. Measure the duct opening in your floor wall or ceiling. Many of our vent grilles include directional patterns so it is crucial to provide both dimensions in their respective order. Note if the register or grille you are replacing is for a wall ceiling or floor.

Remove screws holding the vent in place. Most vent faceplates are large enough to support the register and cover the entire hole. Pull the vent forward and out of the opening. For sizing please use the duct size and reference the overall frame size for installation.

This means that floor registers will often be smaller number first like 4 10 or 4 12. The width and length of your opening should match the duct opening sizes. Then measure the length and width of the air duct opening.