25" x 25" Pleated MERV 8 Filter for HVAC Return Filter Grille [Actual Dimensions: 24.75 X 24.75] 3-Pack w8h8 + Product Details Size &

+ Product Details Size & Compatibilty - The 18" to 14" round metal pipe reducer & increaser 30 gauge is compatible with duct 18" to 14"

+ Product Details Perfect Fit & Easy Sizing - Designed for a 34" x 14" Or 14" x 34" duct opening (measured at the opening)

+ Product Details Size - 24"w X 14"h is the size for the duct opening measurement only

Ideal for Walls & Ceilings: Designed for seamless installation in standard 14" X 8" duct openings

+ Product Details Perfect Fit & Easy Sizing - Designed for a 20" x 10" OR 10" x 20" duct opening (measured at the opening)

25" x 25" Pleated MERV 8 Filter for HVAC Return Filter Grille [Actual Dimensions: 24.75 X 24.75] 3-Pack w8h8 + 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