Performed a first floor dryer vent cleaning. Dryer vent, duct. Flex duct and lint trap are all clear of lint and debris at this time. Upon arrival customer stated that the dryer is making a strange noise. After cleaning everything I inspected the dryer and believe that the noise is due to the belt wearing our. Otherwise dryer is functioning properly at this time and exhaust flow is optimal. Recommend dryer vent cleaning every 1-2 years. Thank you for your business!