NFPA (National Fire Protection Agency) reports:

1 out of every 22 home structure fires are due to washers and dryers.

16,800 structure fires reported in 2010 involved washers and dryers.  Clothes dryers account for 92% of fires. 

ALSO, dryer vents can be a MAJOR entry/exit way for pests and rodents.

CALL CIMEX4U!