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+ Product Details Size – 25"w X 20"h is the size for the duct opening measurement only
+ Product Details Size & Compatibility – The size of sheet metal pipe is 4" round x 120" long
Actual Filter Size – 24 3/4"w x 23 3/4" x 1"
+ Product Details Size – 18"w X 10"h is the size for the duct opening measurement only
Example: If your hole is 20" wide by 14" tall
18" x 22" Pleated MERV 8 Filter for HVAC Return Filter Grille Compatible With Duct 12in + Product Details Size –18" x 22" Pleated MERV 8 Filter for HVAC Return Filter Grille Actual Dimensions: 17. 75" X 21. 75" A Uniquie Combination of Cotton & Synthetic Fibers Gives You The Most Filtration And The Least Air Resistance Equals Great Air & Easy Airflow For Your System The "W" Shaped Pleats Give You More Filter Surface Thereby Capturing More Dust All Our Filter Are Tested Per ASHRAE 52. 2 Standards MERV 8 And An Average Arrestance Of 90 94% Extra Strong Frame Our