How to Measure Vent Covers
101 To Measuring Wall, Ceiling & Floor Vents
Step One
Unscrew and remove your current floor, wall, or ceiling vent cover.
Step Two
Measure the duct opening length and width/height (as shown)
IMPORTANT: Do not measure the vent cover itself. This can lead to inaccurate measurements.
Step Three
Order the corresponding vent cover size (duct opening size).
NOTE: You can size up within 0.5" of your cover, but you cannot size down. Example: Measured 3.75" you CAN USE 4". Measured 4.25" you CANNOT use 4".
Measuring Hinged Air Returns (with filter)
Hinged air returns allow easy access to change the filter.
The hinged air returns are ordered by the SIZE OF THE FILTER. For example, if you have a 24" x 24" filter size, then the proper vent cover size to order is 24" x 24"
Measuring for Flush Mount Wood Registers & Returns
Flush mount wood registers & returns are available in two, distinct types.
The flush mount with frame (pictured) is typically installed at the same time flooring is installed. For sizing, please measure the duct size and reference the overall frame size for installation.
The flush mount no frame is also ordered by measuring the duct size; however, the overall size of the opening must be considered. For example, a 4" x 10" flush mount wood register has an overall size of 6" x 12".
Measuring for Baseboard Registers & Returns
For baseboard registers & returns and baseboard heater covers, measure the overall length needed. If the length needed is 15" then you would order the corresponding 15" baseboard register or return.
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