16" x 16" Duct Hole Aluminum 4-Way Ceiling/Wall Vent Cover: Adjustable Curved Blade Air Supply Diffuser, Multi-Shutter Damper, Plastic Seal for Tight Fit, Quiet Air Flow, 17.6" x 17.6" Face

Additional Details from the Manufacturer

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• PROPER SIZING FIRST: Before purchasing, measure your ceiling opening at exactly 16" x 16". The visible face measures 17.6" x 17.6", ensuring a tight, seamless fit for a smooth, professional finish after installation
• EASY INSTALLATION: This air supply diffuser installs effortlessly on ceilings, drop ceiling panels, or drywall. Ideal for both residential and commercial settings, it serves as a practical ceiling vent cover and diffuser for optimized airflow.
• SCREWS INCLUDED: This vent cover comes with galvanized steel cross-head screws (5/32" diameter x 1 1/2" length, white head), good for securing the diffuser to wood and drywall. Ideal for use in heater vent covers or heat vent installations.
• NOT FOR FLOOR OR EXTERIOR USE: Specifically designed for indoor ceiling applications only, this diffuser is not intended for use on floors or in outdoor environments, ensuring durability and efficiency in regulation for indoor spaces.
• SEMI-MATTE WHITE FINISH: Coated in a semi-matte Laminaire W finish (like RAL 9003), this vent cover offers an elegant aesthetic that complements various interior decors, providing a stylish and functional solution.