3. Plastic dryer vents–Dryer vent safety is not something we take lightly. The CPSC estimates that over 15,000 dryer fires are started every year. A plastic dryer vent will quickly melt and allow the flame to spread. Although metal dryer vents can’t stop the fire from spreading, they do allow more time to detect, vacate the home, and have the fire extinguished. The plastic dryer vents serve no purpose in a home. Some argue they applicable for bathroom vents or other mechanical ventilation systems. We believe you are better off spending the extra money for more durable materials.