22" x 24" Cube Core Eggcrate Return Air Filter Grille for 1" Filter Grilles + Product Details Size –

+ Product Details Size – 26" x 36" or 36" x 26" is the size for the duct opening measurement only

+ Product Details Size – 24" x 24" with 6" collar T-Bar drop ceiling perforated return grill - metal back casing

Actual Filter Size – 13 3/4"w x 33 3/4" x 1"

+ Product Details Size - 20"w X 22"h is the size for the duct opening measurement only

Ring Base Design – Allows for easy installation without removing the thermostat

22" x 24" Cube Core Eggcrate Return Air Filter Grille for 1" Filter Grilles + Product Details Size –+ Product Details Perfect Fit & Easy Sizing Designed for a 22" x 24" OR 24" x 22" duct opening (measured at the opening), with actual outer dimensions of 24. 5" W x 26. 5" H. Please check the measuring guide to ensure a proper fit. Filter Size 21. 75" x 25. 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