How To Measure Floor Vent Size

Pull the vent forward and out of the opening.

How to measure floor vent size.

The flush mount no frame is also ordered by measuring the duct size. A register is measured by the size of its louvers which is the bottom of the register that fits into the ventilation duct. 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. Then measure the length and width of the air duct opening. Many of our vent grilles include directional patterns so it is crucial to provide both dimensions in their respective order. For floor registers they follow the same rules as return grilles where you state the dimension parallel to the louvers first.

Remove screws holding the vent in place. Remove the screws that hold the vent in place. This means that floor registers will often be smaller number first like 4 10 or 4 12. For example a 4 x 10 flush mount wood register has an overall size of 6 x 12.

To measure your register properly remove the existing register from the floor wall or ceiling in which it is installed. Take out the existing floor register and measure the length width of the opening in inches all registers will be listed in inches. However the overall size of the opening must be considered. If your duct work opening in the floor is 4 x 10 you ll need to purchase a 4 10 floor register.

How to measure and replace a floor register. The length l is always expressed first followed by the height h dimension. Measure the duct opening in your floor wall or ceiling. Note if the register or grille you are replacing is for a wall ceiling or floor.

The width and length of your opening should match the duct opening sizes. Measure the size of the air duct opening. Length in inches by height in inches this is your duct opening size.