30" x 16" or 16" x 30" Cube Core Eggcrate Return Air Filter Grille for 1" Filter w16h16 Actual Filter Size – 24

Actual Filter Size – 24 3/4"w x 15 3/4" x 1"

+ Product Details Size – 12"w X 20"h is the size for the duct opening measurement only

Solid Base Construction – Features a solid base for stable installation and reliable protection

+ Product Details Size - 36"w X 28"h is the size for the duct opening measurement only

3 * insulation density is 30kgs/cbm = 0

30" x 16" or 16" x 30" Cube Core Eggcrate Return Air Filter Grille for 1" Filter w16h16 Actual Filter Size – 24+ Product Details Perfect Fit & Easy Sizing Designed for a 30" x 16" OR 16" x 30" duct opening (measured at the opening), with actual outer dimensions of 32. 5" W x 18. 5" H. Please check the measuring guide to ensure a proper fit. Filter Size 29. 75" x 15. 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