Aeroseal is a product that seals small leaks in the ductwork. No attic work is required by the crew to work the equipment. It is monitored by a computer program that tells when the pressure of the ductwork is low enough that most of the leakage has been sealed.
The plus side to Aeroseal is that:
1. It is able to reach inaccessible parts if the attic such as flat roofs.
2. No attic work has to be done.