Ordering new vents can be tricky, but getting the right fit comes down to one simple, golden rule. If you follow this guide, you will get the perfect size every time.
The Golden Rule: Measure the Hole, Not the Cover
The most common mistake homeowners make is measuring their existing vent cover. Do not do this.
To get the correct measurement, you must remove your old vent and measure the actual duct opening in your floor or wall.
Why?
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Face plates vary: Existing covers have wide borders or different styles that make them unreliable for sizing.
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Openings are standard: The duct opening is the only measurement that matters for fitment.
One Rule for Every Style
Whether you are upgrading to our Drop-In Framed Vents or our sleek Undermount Flush Vents, the measurement process is exactly the same. We size our vents based on standard duct openings (e.g., 4"x10"), ensuring a precise fit regardless of the style you choose.
Walls and Ceilings? Same Deal.
This rule is universal. Whether you are measuring for a floor register, a wall return, or a ceiling vent, always measure the duct opening first.
Ready to upgrade your home's look?
Now that you have your measurements, browse the Khan Supply CO collection to find the perfect finish for your space.
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