How do I measure my vents?

Homes are designed with a wide variety of vent sizes. We understand it can be tricky when measuring your vents. And we want you to save as much time as you can during this process. Our measuring guide abides by the classic saying of "measure twice, purchase once."

The marketed size of our Fittes Vents (i.e. "4x10", "4x12") refers to the base or body of the vent (what fits into the duct opening). Below are the do's and don'ts of measuring your vents. Trust us... this works!

Follow these 2 Steps:

1) Remove the existing air register or air return cover.

2) Measure the height and width of the duct opening twice (to verify accuracy). These measurements will tell you what size you need.

Be sure to follow these Dos and Don'ts when measuring:

DO: Follow the photo below to measure your duct opening correctly

DO: Round down on measurements that are ".5" or lower and round up on measurements that are above ".5" to find the right size Fittes vent for you.

For example:

- if your duct measures 3.5" then round to 3"

- if your duct measures 3.75" then round to 4"

DON'T: Take your old vent out & measure it

This will lead to measurement inaccuracies.

DON'T: Leave your old vent in & measure it

This will also lead to measurement inaccuracies. Since the base/body of a vent is what fits into the duct opening, measuring the outside of an old vent will not yield accurate measurements. Note: a Fittes Vent does not have the same size or shape of traditional grilled vents like the photo above.

DO: Remove your old vent & measure your duct opening

After you have your measurements and have found the right sized vent for your project, open up the detailed dimensions on our site for the collection you're looking at and double check the measurements before ordering to make sure that the fit will be right. If you need help with any of this, we're here for you! Just ask us :)

Once you know the correct size, we also recommend verifying our Airflow Specs here and consulting an HVAC specialist prior to purchasing.

How do I measure my vents?Updated 9 months ago