Round Metal Pipe Reducer & Increaser | 12" to 4" HVAC Duct Reducer or Increaser 30g Gauge | Galvanized Sheet Metal Ducting Connector is Compatible with Duct 4" w26h26 + Product Details Size - 4 X 12 Is CRFG2028 Width_14in

+ Product Details Size - 28"w X 28"h is the size for the duct opening measurement only

Actual Filter Size – 17 3/4"w x 21 3/4" x 1"

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Round Metal Pipe Reducer & Increaser 12" to 4" HVAC Duct Reducer or Increaser 30g Gauge Galvanized Sheet Metal Ducting Connector is Compatible with Duct 4" w26h26 + Product Details Size 4 X 12 Is CRFG2028 Width_14in + Product Details Size 28"w X 28"h is the size for the duct opening measurement only Actual Filter Size – 17 3 4"w x 21 3 4" x 1"