34" x 12" Cube Core Eggcrate Return Air Filter Grille for 1" Filter Grille Ideal for Walls & Ceilings:

Ideal for Walls & Ceilings: Designed for seamless installation in standard 16" X 16" duct openings

Actual Front End Outer Dimensions Are 14" Width X 8" Height - SEE IN DESCRIPTION HOW TO MEASURE A GRILLE

Actual Filter Size – 31 3/4"w x 29 3/4" x 1"

our Round Air Vent Supply Grille is the perfect addition

+ Product Details Perfect Fit & Easy Sizing - Designed for a 22" x 30" OR 30" x 22" duct opening (measured at the opening)

34" x 12" Cube Core Eggcrate Return Air Filter Grille for 1" Filter Grille Ideal for Walls & Ceilings:+ Product Details Perfect Fit & Easy Sizing Designed for a 34" x 12" Or 12" x 34" duct opening (measured at the opening), with actual outer dimensions of 36. 5" W x 14. 5" H. Please check the measuring guide to ensure a proper fit. Filter Size 33. 75" x 11. 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