34" x 14" Cube Core Eggcrate Return Air Filter Grille for 1" Filter Color_R-8.0 Pink + Product Details Size –

+ Product Details Size – 6" x 20" or 20" x 6" is the size for the duct opening measurement only

+ Product Details Size - 18"w X 32"h is the size for the duct opening measurement only

+ Product Details Perfect Fit & Easy Sizing - Designed for a 18" x 12" OR 12" X 18" duct opening (measured at the opening)

Actual Front End Outer Dimensions Are 16" Width X 5" Height - SEE IN DESCRIPTION HOW TO MEASURE A GRILLE

34" x 14" Cube Core Eggcrate Return Air Filter Grille for 1" Filter Color_R-8.0 Pink + Product Details Size –+ Product Details Perfect Fit & Easy Sizing Designed for a 34" x 14" Or 14" x 34" duct opening (measured at the opening), with actual outer dimensions of 36. 5" W x 16. 5" H. Please check the measuring guide to ensure a proper fit. Filter Size 33. 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