22" x 34" Cube Core Eggcrate Return Air Filter Grille for 1" Filter 8in diameter Its locking eight-tumbler mechanism and

Its locking eight-tumbler mechanism and supplied key safeguard your thermostat from tampering

very easy to do

+ Product Details Size – 22"w X 30"h is the size for the duct opening measurement only

+ Product Details Size – 14" x 20" or 20" x 14" is the size for the duct opening measurement only

actual front end outer dimensions are approximately 34 5/8" width X 38 5/8" height

22" x 34" Cube Core Eggcrate Return Air Filter Grille for 1" Filter 8in diameter Its locking eight-tumbler mechanism and+ Product Details Perfect Fit & Easy Sizing Designed for a 22" x 34" OR 34" x 22" duct opening (measured at the opening), with actual outer dimensions of 24. 5" W x 36. 5" H. Please check the measuring guide to ensure a proper fit. Filter Size 21. 75" x 33. 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