12" x 8" or 8" x 12" Cube Core Eggcrate Return Air Filter Grille for 1" Filter - Aluminum - White [Outer Dimensions: 14.5" X 10.5"] Compatible with Duct 8" actual front end outer dimensions

actual front end outer dimensions are approximately 20 5/8" width X 26 5/8" height

Actual Front End Outer Dimensions Are 16" Width X 10" Height - SEE IN DESCRIPTION HOW TO MEASURE A GRILLE

Actual Filter Size – 7 3/4"w x 11 3/4" x 1"

Actual Filter Size – 7 3/4"w x 33 3/4" x 1"

12" x 8" or 8" x 12" Cube Core Eggcrate Return Air Filter Grille for 1" Filter - Aluminum - White [Outer Dimensions: 14.5" X 10.5"] Compatible with Duct 8" actual front end outer dimensions+ Product Details Perfect Fit & Easy Sizing Designed for a 12" x 8" or 8" x 12" duct opening (measured at the opening), with actual outer dimensions of 14. 5" W x 10. 5" H. Please check the measuring guide to ensure a proper fit. Filter Size 11. 75" x 7. 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