Recently bought a house in FL, washer and dryer in the garage. The dryer took FOREVER to dry loads, towels would take close to 2 hours. I figured before I bought a new dryer I'd check the duct. White vinyl/plasticy duct material wadded up behind the dryer, half full of lint. Cleaned that out, cleaned out the dryer, put in a straight piece of 4 inch semi-rigid pipe right out the exit at the wall. It's like a new dryer, dries beach towel load in 40 minutes, and not even on high heat. The main issue is, we could very readily have had a fire if I hadn't checked, and corrected this.