10 Pack 4" Round x 24" Long (Total 20 Feet) - 30-Gauge Round Duct Sheet Metal Pipe - Snap Lock Vent Pipe [10 Pieces, 2' Each] Grilles + Product Details Size -

+ Product Details Size - 14"w X 25"h is the size for the duct opening measurement only

+ Product Details Perfect Fit & Easy Sizing - Designed for a 36" x 18" OR 18" x 36" duct opening (measured at the opening)

+ Product Details Perfect Fit & Easy Sizing - Designed for a 14" x 30" OR 30" X 14" duct opening (measured at the opening)

If you still have the fiberglass low quality filter that is below MERV 4

+ Product Details Perfect Fit & Easy Sizing - Designed for a 6" x 16" or 16" x 6" duct opening (measured at the opening)

10 Pack 4" Round x 24" Long (Total 20 Feet) - 30-Gauge Round Duct Sheet Metal Pipe - Snap Lock Vent Pipe [10 Pieces, 2' Each] Grilles + Product Details Size -+ Product Details Size & Compatibility The size of sheet metal pipe is 4" round x 24"long, compatible with duct 4" 10 in a pack 4 inch diameter pipe 20 foot length when connected 30 gauge thick & made of thick & durable galvanized sheet metal Premium Quality Made in the USA. our solid dryer vent pipe is made of high quality galvanized sheet metal with crimped ends (snap lock design) for easy fitting and secure connection to consecutive duct joints