Understanding Aeroseal Technology: Revolutionising Duct Sealing 

Many commercial buildings lose between 25% to 40% of their heated or cooled air through small, hidden leaks in the ductwork. This means your HVAC system has to work harder to keep your office comfortable, leading to higher energy bills and uneven temperatures throughout. 

Aeroseal solves this problem with a unique, non-invasive technology that seals those leaks from the inside. It finds and plugs the gaps without tearing into walls or ceilings, helping your system run more efficiently and improving overall comfort throughout your office. 

In this article, we’ll break down how Aeroseal technology works, why it’s so effective, and how it’s changing the way we approach duct sealing. 

What Is Aeroseal and How Was It Developed 

Aeroseal is a patented technology from NASA that seals leaks in air duct systems from the inside. It works on both new and existing ducts, making it a versatile solution for improving HVAC efficiency. 

The technology was first developed in 1994 by Dr. Mark Modera, a researcher at the University of California. It was part of a project funded by the U.S. Department of Energy (DOE) and the Environmental Protection Agency (EPA). The University of California later received patents for Aeroseal in 1996 and 1999. 

Aeroseal gained national recognition when the DOE named it one of the top 23 most beneficial technologies developed in the agency’s 23-year history. The DOE even called it “one of the best scientific and technological accomplishments” since the department was created. 

How Aeroseal Seals Duct Leaks from the Inside 

The Aeroseal process seals air duct leaks using a precise and smart method. Here’s how it works: 

First, technicians block all the vents and registers to pressurize the duct system. Then, they measure how much air is leaking to get a starting point. Once that’s done, a special machine blows a mist of tiny sealant particles into the ducts. 

What’s unique about Aeroseal is that these particles don’t coat the entire duct. Instead, they stay suspended in the air and only stick to the edges of the leaks. As the air escapes through small cracks or holes, it pulls the particles toward the leak. The particles then build up at those spots and seal the gaps, kind of like how a scab forms to close a cut. 

Throughout the process, a computer system tracks everything in real time and adjusts pressure and airflow as needed to make sure the sealing is accurate and effective. 

The Science Behind the Sealant: Safe, Non-Toxic, and Effective 

The Aeroseal sealant is made mainly from vinyl acetate polymer—a safe compound also found in things like water-based paints, hairspray, and some chewing gum. It’s a water-based formula (about 65% water) and is designed to be non-toxic and safe for use indoor enviornment. 

To prove its safety, the sealant has been certified by Underwriters Laboratories (UL) for low smoke and flame spread. It’s also extremely effective, outperforming traditional duct sealing methods by up to 90%. It can seal leaks as wide as 5/8 of an inch and is built to last at least 10 years, with some lab tests suggesting it could last over 40 years. 

Key Benefits of Aeroseal Duct Sealing 

The effectiveness of proper duct sealing extends far beyond mere leak repair. Properly sealed ductwork creates a foundation for multiple performance improvements throughout HVAC systems. 

Energy Efficiency and Lower Utility Bills 

Leaky air ducts make your heating and cooling system work harder than it needs to, wasting energy and money. Aeroseal fixes this problem by sealing the ducts from the inside, creating a tight seal so that heated or cooled air goes exactly where it’s supposed to. 

This helps stop air from escaping into places like attics, crawlspaces, or inside walls. As a result, office occupants often see energy savings of 20% to 40% on their heating and cooling bills. Plus, because the HVAC system doesn’t have to work as hard, it tends to need fewer repairs and can last longer. 

Improved Airflow and Temperature Control 

When ducts have leaks, air doesn’t flow evenly through a building. This can cause hot and cold spots, making some rooms uncomfortable no matter how much you adjust the thermostat. 

Aeroseal solves this by sealing the leaks so that conditioned air reaches every room as it should. After sealing, airflow becomes more balanced, and temperature differences between rooms are greatly reduced. Spaces that were once too hot or too cold become consistently comfortable. 

With less strain on the system, HVAC units also tend to run more quietly. As a result of better air delivery, future HVAC replacements may not need to be as large, leading to savings in both space and money. 

Enhanced Indoor Air Quality Through Dust and Allergen Control 

Leaky return ducts actively pull dust, allergens, and pollutants from unconditioned spaces into working areas. Conversely, supply duct leaks allow conditioned air to escape, creating negative pressure that draws in outdoor contaminants. 

Aeroseal technology eliminates these pathways for contaminants, significantly reducing the circulation of particulates throughout buildings. This improvement proves particularly beneficial for individuals with respiratory conditions, allergies, or asthma. 

Long-Lasting Seals with Minimal Disruption 

Unlike traditional tape and mastic methods that deteriorate over time, Aeroseal creates durable polymer-based seals. The application process requires minimal invasive work—technicians access the system at strategic points rather than needing to expose all ductwork. 

The entire sealing procedure typically completes within 4-8 hours for residential applications, with the space remaining usable shortly afterward. Notably, the sealant remains flexible after curing, allowing it to withstand normal building movements and temperature fluctuations without cracking or separating from duct surfaces. 

Where Aeroseal Makes the Biggest Impact 

Aeroseal technology delivers remarkable results across diverse building environments, with each setting experiencing unique benefits from properly sealed ductwork. 

Residential Homes: Better Comfort, Cleaner Air 

Beyond performance, one of Aeroseal technology biggest advantages is its simplicity. The entire sealing process can typically be completed in a few hours—without the need to tear down walls or ceilings. Since the sealant works from the inside of the ducts, there’s minimal mess and no major construction, and homeowners can return to using their HVAC system the same day. 

For example, a newly built home in Mankato, Minnesota, where ducts had already been installed and manual sealing attempts had failed to bring leakage within code requirements. In just about 90 minutes (including setup and sealing), Aeroseal reduced leakage from over 537 CFM down to under 25 CFM, bringing the system well below the local code threshold, without any destruction of drywall or interior finishes. 

This makes Aeroseal an ideal retrofit solution for older homes with inaccessible ductwork, as well as for new constructions where clean, effective performance is a priority. 

Commercial Buildings: Code Compliance and Cost Savings 

Commercial applications of Aeroseal deliver impressive financial returns. Real-world examples from over 300,000 global deployments demonstrate Aeroseal reducing leakage by up to 90% in commercial buildings, sometimes saving owners upwards of SGD 268,416.05 annually in utility and maintenance costs. 

Consequently, the technology helps buildings meet increasingly stringent energy codes and standards. Aeroseal can reduce duct leakage by up to 95%, ensuring HVAC systems operate at optimal efficiency and comply with requirements specified by ASHRAE 90.1. 

In contrast to traditional sealing methods, Aeroseal offers verifiable results—the technology monitors leakage in real-time while sealing, guaranteeing code compliance without guesswork. 

Industrial Spaces: Clean Environments with Minimal Air Loss 

Industrial and specialised facilities see perhaps the most dramatic improvements. The central train station in Mecca, Saudi Arabia, discovered its massive HVAC system was leaking nearly a hot air balloon’s worth of air every minute at an estimated annual cost exceeding SGD 134,208.03. After Aeroseal treatment, leaks decreased by an astonishing 98.25%. 

Is Aeroseal Duct Sealing Right for You? 

Identifying whether your property requires professional duct sealing is the first step toward improved HVAC efficiency. Fortunately, several telltale signs can help determine if Aeroseal might be the solution for your specific situation. 

Common Signs You Need Duct Sealing 

Watch for these warning signals that indicate compromised ductwork: 

• Unusually high utility bills during peak heating and cooling seasons
• Rooms that remain stuffy or difficult to heat and cool despite adjusting thermostats
• Noticeable increase in dust throughout your office
• Uneven temperatures between different rooms
• Whistling or rattling sounds coming from your vents when HVAC is running
• Musty odours or strange smells when your system operates 

Comparing Aeroseal to Manual Sealing Methods 

Manual duct sealant has proven its quality as a traditional solution, typically lasting 10-20 years, though most are only warranted for one year. Nevertheless, manual sealant can become brittle with age, cracking and reopening previously sealed leaks. 

Conversely, Aeroseal provides a complete seal from inside, addressing up to 95% of duct leaks. Its flexible material withstands temperature fluctuations without cracking and comes with a 10-year warranty, although testing shows it can last over 20 years. 

Cost vs. Long-Term Value 

Professional manual duct sealing typically costs between SGD 671.04–SGD 2013.12 depending on ductwork size and damage extent. Aeroseal installation ranges from SGD 2684.16–SGD 6710.40, reflecting its specialised equipment and comprehensive approach. 

Despite higher upfront costs, many office occupants experience 20-30% reductions in utility bills after Aeroseal application. This efficiency gain often means the investment pays for itself within 4-5 years. 

Why Choose Delta Sirius for Duct Sealing in Singapore 

Delta Sirius is a trusted partner for property owners in Singapore seeking effective duct sealing and building performance solutions. With roots dating back to 1983 through its parent company, Delta Sirius brings decades of experience in tackling complex air leakage challenges across a wide range of local buildings. 

From the beginning, our company has been guided by a clear philosophy: to enhance living and working environments through high-quality, technologically advanced solutions. This commitment is reflected in a holistic approach that focuses not just on individual systems, but on the overall performance of the built environment. 

In addition to duct sealing, Delta Sirius provides integrated solutions that improve multiple aspects of building efficiency. our expertise includes: 

• Comprehensive HVAC optimisation 

• Air cleaning and filtration systems 

For property owners looking to achieve long-term improvements in energy efficiency, indoor air quality, and overall building health, Delta Sirius offers customised assessments and tailored solutions, designed to meet Singapore’s unique climate demands and regulatory standards. 

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