Built for optimal performance, this Imperial Rigid Aluminum Pipe is ideal for clothes dryer, bathroom fan, and general purpose venting. Rigid metal transition duct is the recommended material to use when venting a clothes dryer, as it offers the least resistance to airflow and lint buildup. It is also suitable for versatile installation from both the dryer to the wall, and the wall to the exterior vent. This 4-in by 24-in pipe features one smooth end and one crimped end for simple installation, and a snap-lock system that allows for easy closing of the pipe. Its sturdy aluminum construction resists corrosion and fire for safe and lasting reliability. Suitable for clothes dryer, bathroom and general purpose venting Offers the least resistance to airflow and lint buildup Can be installed from both the dryer to the wall and the wall to the exterior vent Easy-to-close snap-lock system Fire-resistant and corrosion-resistant aluminum construction 4-in diameter x 24-in length with 1 crimped end and 1 smooth end Easy to install Recommended by professional installers Type: Round duct pipe Diameter (Inches): 4.0 Length (Inches): 24.0 Gauge: 0.0 Material: Aluminum Warranty: 1-year limited CA Residents: Prop 65 Warning(s): No Safety Listing: Not safety listed UNSPSC: 40141900