Minneapolis, MN  |  612•208•2111

Fast, Effective, Non-disruptive

At GreenSeal, we don’t just seal your ductwork…we Aeroseal it! Traditional duct sealing methods – manual sealing with tape or mastic – only works if you can find and reach the leaks to seal them by hand. In most commercial applications, however, the major of ductwork is hidden behind walls, under insulation or other hard to access locations. Even then, ensuring the entire ductwork is adequately sealed requires a separate testing process and the results only last for a limited time. Aeroseal seals leaks from the inside of the ductwork. That means it can easily find and seal ALL the leaks – even those that are impossible to reach by hand. The computer-controlled process ensures that the leaks are completely sealed and provides a real-time graphic image of the results as the process is taking place. Time-elapsed testing shows that leaks sealed with Aeroseal can last the life of the building.


How is it done?

The Aeroseal process begins when we temporarily block the building’s registers by taping over the grill or removing the grills and placing foam inserts into openings. A large flexible tube is then connected from our computer-controlled delivery system to your ductwork. Now that the registers are blocked, any air being blown from our tubing into your ductwork has only way to escape…through the leaks in the ductwork. This means that even before the sealing process begins, we can blow air into your system and measure the pre-sealing rate of leakage. Once we have a “before” picture of leakage, we begin the sealing process, by blowing microscopic particles of sealant throughout the inside of the duct system. The mist of sealant stays suspended in air until it comes to a leak. Here the particles cling to the edge of the leak and then to other sealant particles, bonding to each other until the entire leak is sealed.

Aeroseal does not coat the entire inside of the ductwork but instead, accumulates around the edges of the leaks. The sealant itself dries immediately and is completely non-toxic. In fact, in most cases, aerosealing can be performed while building occupants are inside the building. Aeroseal is so safe that it has been used in some of the most prestigious hospitals and laboratories around the world.


During the process itself, the computerized sealing system continues to monitor the progress. A visual graph shows the rate of leakage in real time, allowing you to actually watch as the leaks seal and the amount of escaping air is reduced. At the end of the sealing process, we will print out and give you a report that documents the results. You’ll have a detailed analysis of the duct system’s leakage rate before we began and then the final leakage rate. It will tell you the percentage of reduced leakage and calculate the equivalent hole size that the combined leaks represent.