How To Measure Floor Vent Size

You could also use a 4 x10 floor register if your hole measured 4 1 4 x 10 1 2.

How to measure floor vent size.

The width and length of your opening should match the duct opening sizes. Note if the register or grille you are replacing is for a wall ceiling or floor. Most vent faceplates are large enough to support the register and cover the entire hole. 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.

Pull the vent forward and out of the opening. How to measure and replace a floor register. This means that floor registers will often be smaller number first like 4 10 or 4 12. Remove screws holding the vent in place.

Measure the duct opening in your floor wall or ceiling. The length l is always expressed first followed by the height h dimension. Then measure the length and width of the air duct opening. Remove the screws that hold the vent in place.

However the overall size of the opening must be considered. Take out the existing floor register and measure the length width of the opening in inches all registers will be listed in inches. Many of our vent grilles include directional patterns so it is crucial to provide both dimensions in their respective order. Measure the size of the air duct opening.

Length in inches by height in inches this is your duct opening size. Locate the register or grille you are replacing and note if it is for a wall ceiling or floor. For floor registers they follow the same rules as return grilles where you state the dimension parallel to the louvers first. A register is measured by the size of its louvers which is the bottom of the register that fits into the ventilation duct.

For example a 4 x 10 flush mount wood register has an overall size of 6 x 12. If your duct work opening in the floor is 4 x 10 you ll need to purchase a 4 10 floor register. For sizing please use the duct size and reference the overall frame size for installation.