Made in the USA and meeting the highest quality standards of Jones Stephens, the 4” x 24” Aluminum Duct Pipe for Dryer Vent is manufactured for venting purposes in aluminum that meets the code requirements for 2012 IMC – International Mechanical Code (Section 504.6.1) and 2012 IRC – International Residential Code (Section M1502.4.1) for material and size. With a 4” diameter, one end of the pipe is crimped and one end is smooth. Manufactured in corrosion-resistant materials, the Aluminum Duct Pipe is fully assembled for easy and quick installation!