Plastic dryer vent is not allowed in Minnesota. Must be metallic, 14 feet maximum length, with 2 elbows. Maximum flexible metal is 6 feet.
Common Defects - Dryer, Kitchen, and Bath Exhaust
Here are some common items found on a typical inspection
Plastic pipe
Opening in dryer vent
No openings are allowed in dryer vents.
Dryer vent to interior
Dryers must vent directly to the exterior.
Kitchen vent into Attic
Kitchen exhaust must vent to exterior.
Bath vent into Attic
Bath exhaust must vent to exterior.