16" x 30" or 30" x 16" Cube Core Eggcrate Return Air Filter Grille for 1" Filter 12in diameter our damper helps create a

our damper helps create a well-balanced indoor environment

By simply measuring the width or the length of the vent

Actual Front End Outer Dimensions Are 14" Width X 5" Height - SEE IN DESCRIPTION HOW TO MEASURE A GRILLE

+ Product Details Size - 10"w X 10"h X 2"d (for duct opening measurement only)

actual front end outer dimensions are 25" Width X 19" Height

16" x 30" or 30" x 16" Cube Core Eggcrate Return Air Filter Grille for 1" Filter 12in diameter our damper helps create a+ Product Details Perfect Fit & Easy Sizing Designed for a 16" x 30" OR 30" X 16" duct opening (measured at the opening), with actual outer dimensions of 18. 5" W x 32. 5" H. Please check the measuring guide to ensure a proper fit. Filter Size 15. 75" x 29. 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