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" End Register Duct Boots + Product Details Size -

+ Product Details Size - 28"w X 18"h is the size for the duct opening measurement only

Actual Filter Size – 33 3/4"w x 23 3/4" x 1"

+ Product Details Size - 10"w X 6"h is the size for the duct opening measurement only

+ Product Details Size - 8"w X 10"h X 2"d (for duct opening measurement only)

actual front end outer dimensions are 25" Width X 25" Height

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" End Register Duct Boots + Product Details Size -+ Product Details Size & Compatibilty The 12" to 4" round metal pipe reducer & increaser 30 gauge is compatible with duct 12" to 4". Made in the USA Premium Quality Our galvanized ducting connector is made of high quality galvanized sheet metal. Applications Reducers transition ducts from larger to smaller sizes and ensure smooth, continuous airflow. + Product Description The HVAC Premium Round Metal Pipe Reducer & Increaser is crafted from high