End Register Duct Boots - 12" X 6" X 8" Round End Center is Compatible with Duct 8" w18h18 + Product Details Perfect Fit LO246 Product Details Size 32 Compatible with Duct 4"

+ Product Details Perfect Fit & Easy Sizing - Designed for a 30" x 20" OR 20" x 30" duct opening (measured at the opening)

+ Product Details Size – 20"w X 26"h is the size for the duct opening measurement only

Actual Filter Size – 25 3/4"w x 19 3/4" x 1"

Minimum Efficiency Reporting Value (MERV) is a standard that rates the overall effectiveness of air filters

End Register Duct Boots 12" X 6" X 8" Round End Center is Compatible with Duct 8" w18h18 + Product Details Perfect Fit LO246 Product Details Size 32 Compatible with Duct 4" + Product Details Perfect Fit & Easy Sizing Designed for a 30" x 20" OR 20" x 30" duct opening (measured at the opening) + Product Details Size – 20"w X 26"h is the size for the duct opening measurement only