30" x 26" Cube Core Eggcrate Return Air Filter Grille for 1" Filter ceiling + Product Details Size –

+ Product Details Size – 18"w X 22"h is the size for the duct opening measurement only

+ Product Details Size – 22"w X 22"h is the size for the duct opening measurement only

+ Product Description Protect and secure your thermostat with this high-quality Clear Plastic Thermostat Guard

Filter grille features a user-friendly plastic latch that requires no screwdriver for opening

Upgrade your HVAC system with our cutting-edge 360-degree airflow grill

30" x 26" Cube Core Eggcrate Return Air Filter Grille for 1" Filter ceiling + Product Details Size –+ Product Details Perfect Fit & Easy Sizing Designed for a 30" x 26" OR 26" x 30" duct opening (measured at the opening), with actual outer dimensions of 32. 5" W x 28. 5" H. Please check the measuring guide to ensure a proper fit. Filter Size 29. 75" x 27. 75" x 1" Premium Airflow Efficiency High performance cube core eggcrate design allows 95% airflow efficiency, reducing energy costs and maximizing HVAC system lifespan. Durable, Rust Free Aluminum