According to the Building code your clothes dryer (gas or electric) must be vented to the outside, be constructed of metal ductwork and have joints sealed by aluminized heatproof tape or a heatproof mastic.
You can have Tom the Plumber (617-697-7953) check it out and upgrade your clothes dryer vents to code. Tom’s concern and advice come from the many installations he sees daily. Problems he sees are; vinyl ducts, filled with lint, disconnected duct venting to the cellar and sheet metal screws connecting duct sections. The screws are a particular problem because they protrude to the inside of the duct to catch and accumulate lint which can buildup. So let’s minimize cleaning requirements and check it out now.
According to the NFPA: In 2006, an estimated 17,700 reported U.S. non-confined or confined home*
structure fires involving clothes dryers or washing machines (including
combination washer/dryers) resulted in an estimated: • 15 civilian deaths
• 360 civilian injuries
• $194 million in direct property damage
• Most of these home fires involve clothes dryers (92% in 2003-2006).
• The leading cause (29% of fires) of home clothes dryer and washer fires was
failure to clean.