How To Measure Floor Vent Size

Take out the existing floor register and measure the length width of the opening in inches all registers will be listed in inches.

How to measure floor vent size.

Locate the register or grille you are replacing and note if it is for a wall ceiling or floor. You could also use a 4 x10 floor register if your hole measured 4 1 4 x 10 1 2. Remove screws holding the vent in place. How to measure and replace a floor register.

Many of our vent grilles include directional patterns so it is crucial to provide both dimensions in their respective order. If your duct work opening in the floor is 4 x 10 you ll need to purchase a 4 10 floor register. Note if the register or grille you are replacing is for a wall ceiling or floor. A register is measured by the size of its louvers which is the bottom of the register that fits into the ventilation duct.

The width and length of your opening should match the duct opening sizes. 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. However the overall size of the opening must be considered. Pull the vent forward and out of the opening.

Measure the opening in your floor wall or ceiling. The length l is always expressed first followed by the height h dimension. This means that floor registers will often be smaller number first like 4 10 or 4 12. For sizing please use the duct size and reference the overall frame size for installation.

Remove the screws that hold the vent in place. Then measure the length and width of the air duct opening. For floor registers they follow the same rules as return grilles where you state the dimension parallel to the louvers first. Length in inches by height in inches this is your duct opening size.

To measure your register properly remove the existing register from the floor wall or ceiling in which it is installed. Measure the duct opening in your floor wall or ceiling. Measure the size of the air duct opening.