![How to measure a baseboard vent](https://cdn.shopify.com/s/files/1/0607/5351/0646/files/web-bb-vent-instructions-01_600x600.jpg?v=1714405978)
Step 1
Remove the existing vent cover from the baseboard to expose the vent opening.
Note: For most applications, the vent opening is on the floor and flush against the wall.
![Step 1 How to measure a baseboard vent](https://cdn.shopify.com/s/files/1/0607/5351/0646/files/web-bb-vent-instructions-02_600x600.jpg?v=1714406064)
Step 2
With a tape measure, measure the width (front to back) of the vent opening in the floor.
![Step 2 How to measure a baseboard vent](https://cdn.shopify.com/s/files/1/0607/5351/0646/files/web-bb-vent-instructions-03_600x600.jpg?v=1714406096)
Step 3
Next, measure the length (end to end) of the vent opening in the floor.
Measurement example: If the hole opening in your floor is 2-1/2" wide x 12" long, then place your order for the nearest size up. In this case, it would be: Overall Dimension - 3.5" W x 15" L x 4.75” H.
![Step 3 How to measure a baseboard vent](https://cdn.shopify.com/s/files/1/0607/5351/0646/files/web-bb-vent-instructions-04_600x600.jpg?v=1714406132)
The three available baseboard vent sizes are:
- Overall Dimension: 3.5" W x 15" L x 4.75” H
- Overall Dimension: 3.5" W x 18" L x 4.75” H
- Overall Dimension: 3.5" W x 24" L x 4.75” H