Here's the correct way to vent your clothes dryer - The Washington Post
4" Tumble Dryer Venting Kit - LP Supplies Ltd.
Dryer Vents and Dryer Venting Basic Guide
Amazon.com: 4Inch 10FT Long Flexible Aluminum Air Ducting, Heavy-Duty Black 4 Layer Dryer Vent Hose, Dryer Duct for HVAC Ventilation,duct fan systems, 2 Stainless Steel Clamps Include : Tools & Home Improvement