12" x 26" or 26" x 12" Cube Core Eggcrate Return Air Filter Grille for 1" Filter Compatible with Duct 8" Actual Filter Size – 29

Actual Filter Size – 29 3/4"w x 15 3/4" x 1"

+ Product Details Size - 36"w X 36"h X 2"d (for duct opening measurement only)

+ Product Details Perfect Fit & Easy Sizing - Designed for a 24" x 28" OR 28" x 24" duct opening (measured at the opening)

and lay it flat in the grid

12" x 26" or 26" x 12" Cube Core Eggcrate Return Air Filter Grille for 1" Filter Compatible with Duct 8" Actual Filter Size – 29+ Product Details Perfect Fit & Easy Sizing Designed for a 12" x 26" or 26" x 12" duct opening (measured at the opening), with actual outer dimensions of 14. 5" W x 28. 5" H. Please check the measuring guide to ensure a proper fit. Filter Size 11. 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