Round Stack Boot 12" X 3.25" X 6"- is Compatible with Duct 6" Height_10in + Product Details Size – 190RF 10X20 FBA crafted from heavy gauge Compatible With Duct 7in

+ Product Details Size – 8" x 14" or 14" x 8" is the size for the duct opening measurement only

+ Product Details Perfect Fit & Easy Sizing - Designed for a 20" x 22" OR 22" x 20" duct opening (measured at the opening)

vibration-free performance

Its practical design facilitates easy installations

actual front end outer dimensions are approximately 24 5/8" width X 16 5/8" height

Round Stack Boot 12" X 3.25" X 6" is Compatible with Duct 6" Height_10in + Product Details Size – 190RF 10X20 FBA crafted from heavy gauge Compatible With Duct 7in + Product Details Size – 8" x 14" or 14" x 8" is the size for the duct opening measurement only + Product Details Perfect Fit & Easy Sizing Designed for a 20" x 22" OR 22" x 20" duct opening (measured at the opening)