22" x 14" Cube Core Eggcrate Return Air Filter Grille for 1" Filter Color_Red Oak Wood very easy to do

very easy to do

this model allows for mounting without removing the thermostat

Actual Filter Size – 11 3/4"w x 21 3/4" x 1"

+ Product Details Size – 3"w X 10"h is the size for the duct opening measurement only

this grille offers durability and resistance to rust and corrosion

22" x 14" Cube Core Eggcrate Return Air Filter Grille for 1" Filter Color_Red Oak Wood very easy to do+ Product Details Perfect Fit & Easy Sizing Designed for a 22" x 14" OR 14" x 22" duct opening (measured at the opening), with actual outer dimensions of 24. 5" W x 16. 5" H. Please check the measuring guide to ensure a proper fit. Filter Size 21. 75" x 13. 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