Performed dryer vent cleaning on 8 commercial dryers. All vents, ductwork, flex hoses lint traps and rear of dryers are all clear of lint and debris at this time. Dryer are untested due to being pay machines with no quarters available. Outside vent covers are extremely brittle due to continuous heat exposure and need to be replaced soon. Recommend dryer vent cleaning every 1-2 years. Thank you for your business! This is a billout.