Perfect Fit for 4" x 10" Duct Opening – Precisely designed to fit a 4" x 10" duct opening. Measure the duct opening itself—not your old grille—to ensure accurate alignment, secure installation, and optimal HVAC performance. 2-Way Adjustable Airflow Control – Dual-direction movable blades let you easily direct airflow where needed, improving circulation, maintaining consistent room temperature, and enhancing overall indoor comfort. Wall & Ceiling Versatility – Engineered for both sidewall and ceiling installation, making it ideal for residential homes, offices, and light commercial HVAC supply systems. Heavy-Duty Steel Construction – Built from high-quality steel for superior durability, strength, and resistance to bending, warping, and everyday wear. Clean, Finished Frame Design – Features a sturdy outer frame for a seamless, built-in appearance that elevates the look of your wall or ceiling while ensuring long-lasting stability.