16" x 26" or 26" x 16" Cube Core Eggcrate Return Air Filter Grille for 1" Filter Insulated Line + Product Details Perfect Fit

+ Product Details Perfect Fit & Easy Sizing - Designed for a 14" x 36" OR 36" X 14" duct opening (measured at the opening)

Actual Filter Size – 35 3/4"w x 27 3/4" x 1"

Designed with a ring base for flexible installation

+ Product Details Size - 25"w X 26"h is the size for the duct opening measurement only

+ Product Details Size – 12" x 34" or 34" x 12" is the size for the duct opening measurement only

16" x 26" or 26" x 16" Cube Core Eggcrate Return Air Filter Grille for 1" Filter Insulated Line + Product Details Perfect Fit+ Product Details Perfect Fit & Easy Sizing Designed for a 16" x 26" OR 26" X 16" duct opening (measured at the opening), with actual outer dimensions of 18. 5" W x 28. 5" H. Please check the measuring guide to ensure a proper fit. Filter Size 15. 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