Duct Testing

Anchors Aweigh Energy LLC

Duct Leakage Testing

The ducts on a heating or air conditioning (HVAC) system are what conveys the air from your home, to the heating or cooling equipment and then back to your home. The heating or cooling equipment adds or removes heat from the air and requires energy to do this. If the system is not properly installed then the air you are paying to heat or cool could be blowing into your attic instead of inside your home. Or worse the system could be pulling more air from your home than it is suppling causing unsafe conditions for combustion appliances such as a water heater. The average home in California leaks 30% of its conditioned air to the outside. Most individuals don't grasp how much they are wasting because (hopefully) you cannot see air leaks. Think about it this way, if your plumbing leaked 30% of the water going into your home you would have it fixed today. Not because of the cost of water, because of the damage the water would do to your home. What is duct leakage costing you? What other damage is being caused to your home or your health because of duct leakage? What happens to the moisture in the heated air you are leaking in your walls? Is it causing mold? Building damage?


Open return air plenums like the images above are typical of homes in Southern California. Open returns are a cause of significant duct leakage and indoor air quality problems in the home.

Duct testing involves using a calibrated piece of equipment called a duct blaster. The mechanical system is disabled, the filter is removed, and all of the duct registers in the home are sealed off. The duct blaster is then connected to the largest register in the home, typically the return, and the system is pressurized using the duct blasters powered fan. With the system under pressure (the pressure we use is less than a tenth of the systems normal operating pressure), we are able to measure the amount of air leaking out of your duct system. The higher the leakage number, the more energy the system consumes. Along with wasted energy duct leakage also reduces indoor air quality due to uncontrolled air leakage. Air will always seek the path of least resistance and if the path of least resistance is into your furnace through a wet dirty crawl space, then that is where it is going to come from.


The HERS rater with a Duct Blaster testing a system for total duct leakage.

The allowed amount of leakage on a HVAC system based on current standards is a maximum 6% leakage for new systems, and 15% leakage for desisting systems. To read more about duct leakage testing and compliance options click on Existing system duct test, New system duct test, 60% reduction, 10% leakage to outside, or pass by fog.



Anchors Aweigh Energy LLC  2307 Fenton Parkway #107-143, San Diego, CA 92108

www.aae-hers.com                  800-597-7153                     This email address is being protected from spambots. You need JavaScript enabled to view it.