We use one access/injection point to the ductwork section, and if needed will cut an access hole (ideally 300mm), attach a collar and clamp a length (2.8m) of clear plastic tubing to connect the Aeroseal unit. This unit includes a fan to maintain duct pressure, manometers to measure the pressure differential across the fan, and thermostats and heaters to heat the sealant. Relative humidity is also monitored. A special air compressor connects to the Aeroseal unit, supplying additional air pressure to aerosolise the sealant. The length of plastic tubing between the unit and the duct injection point acts as a mixing zone for the "fog" of sealant which then enters the ductwork.
The information required for the operation of the Aeroseal duct sealing process is:
Using our test equipment at the injection point, we pressurise the duct section and run our pre-seal leakage test. This test gives the air leakage in both L/s and an often more relevant “centimetre squared equivalent hole size”- the total leakage area.
This airflow/leakage information is used within the software that, connected to the Aeroseal unit, drives the sealing process. While we are not independent air leakage testers, our data is very accurate for process reasons.
SmartSeal® software gives live data throughout the Aeroseal sealing process, this monitors ductwork pressure and the reduction in ductwork leakage. If we are unable to maintain the necessary duct pressure to achieve a pre-seal leakage result, this indicates that the leakage is too high to be effectively sealed without modification, so we discuss with our client and identify any missed grilles or larger leak sites that require manual sealing or reduce the size of the duct section and continue.
The test will only take a few minutes and we then commence the sealing process.
Once the ducts are considered sealed, we halt the process and run a post- seal leakage test. We will then remove the prep work and return the ducts to service.
We supply both the pre and post seal leakage test results to our clients in a comprehensive report. We guarantee the durability of the Aeroseal sealant for 10 years, and testing in the has shown no detectable deterioration on sealed leaks after 40 years of accelerated conditions.