Round Metal Pipe Reducer & Increaser | 10" to 9" HVAC Duct Reducer or Increaser 26g Gauge | Galvanized Sheet Metal Ducting Connector is Compatible with Duct 9" End Register Duct Boots + Product Details Size – 4 X 12 Is CRFG2028 Width_14in

+ Product Details Size – 8"w X 36"h is the size for the duct opening measurement only

Actual Filter Size – 29 3/4"w x 17 3/4" x 1"

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

+ Product Details Size – 14" x 28" or 28" x 14" is the size for the duct opening measurement only

Round Metal Pipe Reducer & Increaser 10" to 9" HVAC Duct Reducer or Increaser 26g Gauge Galvanized Sheet Metal Ducting Connector is Compatible with Duct 9" End Register Duct Boots + Product Details Size – 4 X 12 Is CRFG2028 Width_14in + Product Details Size – 8"w X 36"h is the size for the duct opening measurement only Actual Filter Size – 29 3 4"w x 17 3 4" x 1"