We tested some common dryer vent connection kits to see how well they would hold up in the event of a fire. Most people are unaware their connection tube may be flammable. All dryer manufacturers recommend using only an all metal dryer vent kit. In the event of a fire, a metal kit may help keep the fire contained to the dryer vent. Over 15,000 dryer fires occur in the US every year. Most could be prevented with regular dryer vent cleaning and never using anything but an all metal vent kit.