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Duct Testing and Sealing
Why is duct sealing important?
Leaky ductwork is one of the most common problems found in houses. Our tests have shown that leaky ducts can lose as much as 70% of the air you pay to heat or cool. Technicians have found ducts completely disconnected so that most of the air is escaping. Because the air in the ducts is under pressure, a one square inch hole in ductwork loses as much air as a 20 square inch hole in the wall would. Average losses are about 30% and can be reduced to very low levels by proper testing and sealing.

While the whole house needs about three air exchanges an hour for a "healthy house," the ductwork should have as little leakage as possible. Leakage is not only expensive, but can prevent the heating and cooling system from delivering the comfort it should. Worse yet, duct leaks could be creating air quality problems that could affect the family's health. Duct testing can determine how much the house is leaking and pinpoint where the leaks are so the technician can seal them.
What equipment does the tech use? The tech uses several pieces of equipment. He/she will set up a "blower door" over the doorway that blows air into the house, increasing the air pressure inside the house. This measures the amount of air the house is losing.
Then tech will attach a "duct blaster" to the ductwork at the furnace or air conditioning unit. This is used to pressurize or de-pressurize the duct
system to equalize the air pressure in the house to the air pressure in the ductwork. Sensitive gauges then measure the amount of air lost to the outdoors. These devices also measure pressures to assure there is no negative air pressure in the house, which can cause combustion appliances to back draft.


What sort of sealants are used and are they safe for people and animals?
Ducts are sealed with special mastics designed to last for many years. The mastics are water based and are safe for people and animals. When fresh, it can be cleaned
up with water. The mastic dries to a hard finish. It is messy when wet, so assure children and animals should be kept away until the duct is covered with the register cover. After sealing, the tests will be performed again to assure all possible leaks have been sealed.

Will the crossover be replaced?
Double and triple wide mobile homes have a crossover that joins the ducts on each side together. Frequently the crossover has become disconnected or leaky. It will be repaired, reconnected and sealed if possible. If it needs replacing, there could be a charge for purchasing the new crossover.








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