How To Measure Floor Vent Size

The width and length of your opening should match the duct opening sizes.

How to measure floor vent size.

Most vent faceplates are large enough to support the register and cover the entire hole. 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. Many of our vent grilles include directional patterns so it is crucial to provide both dimensions in their respective order.

A register is measured by the size of its louvers which is the bottom of the register that fits into the ventilation duct. However the overall size of the opening must be considered. Remove screws holding the vent in place. If your duct work opening in the floor is 4 x 10 you ll need to purchase a 4 10 floor register.

To measure your register properly remove the existing register from the floor wall or ceiling in which it is installed. For sizing please use the duct size and reference the overall frame size for installation. Remove the screws that hold the vent in place. 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. Pull the vent forward and out of the opening. 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. 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. 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.

Measure the duct opening in your floor wall or ceiling. This means that floor registers will often be smaller number first like 4 10 or 4 12. Measure the opening in your floor wall or ceiling.