Aria Vents Flushmount Lite Matte Black 4"x12" - PRO, $64.99 USD/Box, LL Flooring (Lumber Liquidators)

Customize to match your flooring by fitting a precut piece into the center tray. The flush mount installation offers a seamless floor surface. Provides similar air flow to traditional vent grills, featuring an ultra-minimal, frameless design. Only a single rectangular air channel is visible. Requires installation prior to surface material, best done by a professional.