Keeping your dryer vent clean is important for a number of reasons which include not only energy savings but safety. A dryer works by pushing out hot, moist air so your clothes can dry. If your dryer vent to the outside becomes blocked by lint, the air will not be able to expel moisture like it was designed to do. The lint that has built up over the past few months or year affects not only the operation of your dryer vent but can also be a fire hazard.