25" x 25" Pleated MERV 8 Filter for HVAC Return Filter Grille [Actual Dimensions: 24.75 X 24.75] 3-Pack Compatible With Duct 10in + Product Details Size –

+ Product Details Size – 18"w X 30"h or 30" x 18" is the size for the duct opening measurement only

the second number represents the width

+ Product Details Size & Compatibility – The size of sheet metal pipe is 7" round x 120" long

Size - 10"w X 10"h is the size for the duct opening measurement only

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25" x 25" Pleated MERV 8 Filter for HVAC Return Filter Grille [Actual Dimensions: 24.75 X 24.75] 3-Pack Compatible With Duct 10in + Product Details Size –25" x 25" Pleated MERV 8 Filter for HVAC Return Filter Grille 3 Pack Actual Dimensions: 24. 75" X 24. 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