Unusual Sounds: Scraping or fluttering noises coming within the chimney could reveal an animal nesting inside, which is a standard reason for blockages and may be eliminated professionally. That means the rest is build up in the dryer vent program, limiting airflow and producing your dryer to operate more difficult. https://www.google.com/maps/d/edit?mid=1zd0d3IPdS64YAAjQgqfwsbTmTTNGA7U&usp=sharing