How to Measure for Baseboard Vents

How to measure a baseboard vent

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

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

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
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