VerdictAI

Smart Home · Smart Air Vents

What size smart vent do I need?

Reviewer consensus

Measure the rectangular duct opening, not the decorative cover. Flair sells discrete sizes such as 4x10, 4x12, 6x10, 6x12, and 6x14, and the listings explicitly warn that the wrong size will not seat properly. Booster fans like the AIRTAP T4 are similarly size-locked to 4x10 register holes.

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