30" x 8" Pleated MERV 8 Filter for HVAC Return Filter Grille [Actual Dimensions: 29.75 X 7.75] 3-Pack Adjustable Return + Product Details Size –

+ Product Details Size – 22" x 30" or 30" x 22" is the size for the duct opening measurement only

+ Product Details Size - 36"w X 10"h X 2"d (for duct opening measurement only)

+ Product Details Size - 34"w X 36"h is the size for the duct opening measurement only

Simplified Installation: Our Butterfly Damper ensures easy setup

+ Product Details Size - 18"w X 20"h is the size for the duct opening measurement only

30" x 8" Pleated MERV 8 Filter for HVAC Return Filter Grille [Actual Dimensions: 29.75 X 7.75] 3-Pack Adjustable Return + Product Details Size –30" x 8" Pleated MERV 8 Filter for HVAC Return Filter Grille 3 Pack Actual Dimensions: 29. 75" X 7. 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