Fits 4" x 12" Duct Opening: Designed to fit a 4" x 12" duct opening. Always measure the duct opening itself—not the outer dimensions of your existing grille—to ensure proper alignment and a secure fit. 2-Way Adjustable Airflow Control: Features dual-direction adjustable blades that allow you to control and direct airflow where needed. Helps improve air distribution and overall room comfort. Sidewall & Ceiling Installation: Engineered for versatile use on both sidewalls and ceilings, making it ideal for residential and light commercial HVAC supply applications. Durable Steel Construction: Crafted from high-quality steel for long-lasting strength and performance. Built to resist bending and everyday wear over time. Finished Frame with Clean Outer Dimensions: Includes a sturdy outer frame that delivers a polished, built-in look once installed, enhancing the appearance of your wall or ceiling space.