Dryer Vent Fire Facts and Statistics 

The following information is per usfa.fema.gov and national fire protection association

https://www.usfa.fema.gov/prevention/outreach/clothes_dryers.html
nfpa.org

2,900 home clothes dryer fires are reported each year…

and cause an estimated 5 deaths, 100 injuries, and $35 million in property loss.

Failure to clean the dryer (34 percent)…

is the leading cause of home clothes dryer fires.

Once a year, or more often if you notice that it is taking longer than normal for your clothes to dry…

clean the lint out of the vent pipe or have a dryer lint removal service do it for you.