How To Measure Floor Vent Size

Then measure the length and width of the air duct opening.

How to measure floor vent size.

For example a 4 x 10 flush mount wood register has an overall size of 6 x 12. Measure the opening in your floor wall or ceiling. Note if the register or grille you are replacing 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.

Many of our vent grilles include directional patterns so it is crucial to provide both dimensions in their respective order. However the overall size of the opening must be considered. Length in inches by height in inches this is your duct opening size. Pull the vent forward and out of the opening.

Most vent faceplates are large enough to support the register and cover the entire hole. How to measure and replace a floor register. If your duct work opening in the floor is 4 x 10 you ll need to purchase a 4 10 floor register. This means that floor registers will often be smaller number first like 4 10 or 4 12.

Measure the size of the air duct opening. The flush mount no frame is also ordered by measuring the duct size. 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. Measure the duct opening in your floor wall or ceiling.

The length l is always expressed first followed by the height h dimension. For floor registers they follow the same rules as return grilles where you state the dimension parallel to the louvers first. The width and length of your opening should match the duct opening sizes. Remove the screws that hold the vent in place.

Locate the register or grille you are replacing and note if it is for a wall ceiling or floor. For sizing please use the duct size and reference the overall frame size for installation. A register is measured by the size of its louvers which is the bottom of the register that fits into the ventilation duct.