• It remains rubbery and flexible after it has cured.
  • UL723 listed for smoke and flame spread
  • UL181 listed for Mould growth
  • It is certified Low VOC
  • It takes approximately 2 hours to cure
  • There is a 3 year Commercial Application guarantee

Frequently Asked Questions - Residential

Q: What size of holes can be sealed using the Aeroseal air duct sealing process?

A: Holes and cracks up to 15mm wide can be completely sealed.

Q: What does the Air Duct Diagnostic and Inspection tell me?

A: Inspection discovers any obvious break in the duct work and, as the initial step of the sealing process, the Aeroseal system will establish an exact amount of leakage in the duct system. Of course, many people already know that a room or two in their house doesn’t get good air circulation because they can feel it. Or, they already know that their energy bill is high because they see it. The diagnostic measurement, provides a scientifically valid means to understand the performance of your air duct system. Many people are surprised to learn that homes typically leak 30% to 40% or more of their air through air duct leaks.

Q: What are the estimated savings?

A: Homeowners may save up to 30% on their air conditioning energy bill. Naturally, exact savings are difficult to precisely estimate since they depend on a multitude of variables such as your weather, house condition and design, your heating and air conditioning system, system usage – as well as other factors like energy prices.

Q: How does an Aeroseal air duct seal work?

A: The basic steps are:

  • Block off the registers with foam or plastic.
  • Inject an UL tested and approved aerosol into the duct system.
  • Since the air has no place to go except out through the leaks (the registers are blocked), the sealant material is deposited precisely at the air duct holes or cracks where leakage occurs.
  • A computer and sensors are used to measure and control the progress. The technology is patented from the University of California and the process is endorsed by the US Environmental Protection Agency.
  • Post seal test to measure improvements. • Complete report and certificate to provide a record of improvements.

Q: Does the air duct sealing material become brittle?

A: The vinyl sealing material remains rubbery, never cracking.

Q: How long will the air duct sealing material last?

A: The sealing material has been found in rigorous testing to last over 10 years without failure.

Q: Do air ducts need to be cleaned before air duct sealing?

A: It's likely that the holes and cracks in the ductwork have allowed dust and other particulate matter to enter the system. If you are experiencing extensive levels of household dust, this might be the reason. In most instances, duct cleaning is not found to be required prior to Aeroseal sealing. However if dust and debris build-ups of more than 3mm occur Duct Cleaning may be required. Your Aeroseal Certified Technician can advise whether it will be necessary to clean your ductwork prior to sealing.

Q: Does the sealant coat the inside of the ductwork?

A: The sealant only sticks to the holes in the air duct without coating the rest of the duct.

Q: Is the sealing material used by the Aeroseal air duct sealing system safe?

A: The sealant material consists of a water-based solution (65% water) prior to application. The dried sealant material primarily contains two chemicals, vinyl acetate polymer (VAP) and 2-ethyl-1 hexanol (2E1H). The vast majority of what is left in the duct system is VAP, which has been used in water-based paints, adhesives, and hair spray. VAP has been used in chewing gum, and has no OSHA Exposure Limit. 2E1H is a common industrial solvent and is not considered toxic by OSHA. A review of the literature showed no ill effects after long-term exposure to concentrations of 200 ppm. The largest concentration of 2E1H measured in test houses was 1 ppb (200,000 times smaller), during Aeroseal injection. The sealant is UL-listed for smoke generation and flame spread (UL 723 0,0), and additional testing by UL showed no signs of mould growth or erosion.

Q: Does the sealant leave an odour?

A: The Aeroseal air duct sealing process leaves no lingering odour, and since the sealant material is low VOC and does not put off gas over time, there will be no odour for the life of the product.

Q: If the rooms of my home have inconsistent temperatures, can Aeroseal improve the performance of my heating and A/C system(s)?

A: The Aeroseal sealing system can help improve the comfort of your home by increasing air flows and pressure to supply air throughout the system this can reduce unwanted temperature differences in your home.

Q: Can the Aeroseal air duct sealing system help reduce my utility bills?

A: Some homeowners have saved up to 30% of their air conditioning energy bills after having the Aeroseal air duct sealing system seal their ducted air conditioning system.

Q: Can the Aeroseal air duct sealing system reduce the amount of dust in my home?

A: Return air ductwork that runs through ceiling spaces, under floor areas, garages and any other areas exposed to outside conditions may pull in dust and other indoor air pollutants and distribute them through the air conditioning system. From there they are sent to the living areas of your home. The Aeroseal air duct sealing system can reduce the amount of leakage by as much as 90%, reducing dust and other indoor air pollutants from the conditioned air in your home.

Q: Is the sealing guaranteed?

A: Aeroseal provides a 3 year conditional warranty on the seals created with our process. We have enormous confidence in the quality of our seals since they are based on Lawrence Berkeley National Laboratory research and a patent through the University of California.

Note: the warranty is for on-site seal failures and does not cover additional damage (e.g. an electrician that steps on a duct while running wiring), wear or tear (i.e. the service life of a flexible duct is passed, vermin eat into a duct, or a duct rusts out), and subsequent replacement of failed ducting.