5 pack 16" Round x 24" -Total 10 Feet of pipe - Round Duct Sheet Metal Pipe - 26 Gauge Galvanized - Crimped End Connection [5 pcs 2'] 18in diameter + Product Details Size –

+ Product Details Size – 6" x 12" or 12" x 6" is the size for the duct opening measurement only

actual front end outer dimensions are approximately 36 5/8" width X 12 5/8" height

+ Product Details Size – 22"w X 29"h is the size for the duct opening measurement only

Its smooth

+ Product Details Perfect Fit & Easy Sizing - Designed for a 10" x 26" or 26" x 10" duct opening (measured at the opening)

5 pack 16" Round x 24" -Total 10 Feet of pipe - Round Duct Sheet Metal Pipe - 26 Gauge Galvanized - Crimped End Connection [5 pcs 2'] 18in diameter + Product Details Size –16" X 10' Round Duct Sheet Metal Pipe 5 PACK of 2' pipes 26 Gauge Galvanized Crimped End Connection 5 IN A PACK 16 Inch Diameter Pipe 10 Foot Length When Connected 26 Gauge Thick & Made of Thick & Durable Galvanized Sheet Metal Used For HVAC System Duct Work In Any Building or Home HIGH QUALITY High Quality Galvanized Sheet Metal with Crimped Ends (Snap Lock Design) For Easy Fitting and Secure Connection To Consecutive Duct Joints Made of Galvanized