By Gene and Katie Hamilton

The experts at the National Air Duct Cleaners Assn. suggest hiring a licensed duct specialist who has been certified by their organization. To find one log on to their website

Ask the service to come to your home and perform a system inspection and give you an estimate to clean the ducts. These specialists use a vacuum collection system that is mounted on a truck or trailer or it is a portable unit. Both devices will clean to NADCA standards. The association suggests making a visual inspection of the system before and after cleaning. To get a look inside the ducting use a flash light and a mirror.