16" x 34" or 34" x 16" Cube Core Eggcrate Return Air Filter Grille for 1" Filter 12" Round Duct Pipe this air supply register is

this air supply register is ideal for sidewall and ceiling applications

Actual Filter Size – 25 3/4"w x 9 3/4" x 1"

+ Product Details Size – 18"w X 16"h is the size for the duct opening measurement only

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

16" x 34" or 34" x 16" Cube Core Eggcrate Return Air Filter Grille for 1" Filter 12" Round Duct Pipe this air supply register is+ Product Details Perfect Fit & Easy Sizing Designed for a 16" x 34" OR 34" X 16" duct opening (measured at the opening), with actual outer dimensions of 18. 5" W x 36. 5" H. Please check the measuring guide to ensure a proper fit. Filter Size 15. 75" x 33. 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