VIVOHOME 4 Inch 25 Feet Aluminum Flexible Dryer Vent Hose Air Ducting Non-Insulated with 2 Stainless Steel Clamps for HVAC Ventilation and Exhaust Pack of 1 - - Amazon.com
Inspecting the Dryer Exhaust - InterNACHI®
Here's how to clean your dryer vent in 5 easy steps - CNET