FSEC Examines Leaky Ducts, Air Handlers

May 4, 2002
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COCOA, FL — According to a recent study conducted by the Florida Solar Energy Center (FSEC), most central Florida homes waste energy through leaky air handlers and ducts. The amount of leakage in an average 2,000-sq-ft home can cost the homeowner 10% to 20% more in annual heating and cooling costs compared to an airtight system, says the center.

FSEC researchers discovered this while conducting a study measuring leakage of installed air handlers. The Florida Department of Community Affairs code division funded the study, titled “Field Testing to Characterize the Airtightness and Operating Pressures of Residential Air Handlers.”

FSEC researchers Chuck Withers and Jim Cummings — along with help from Janet MacIlvaine, Jeff Sonne, and Matt Lombardi — measured air handler and duct leakage in 30 homes built last year in central Florida.

The study found leakage in ductwork was higher than expected. Withers said he was disappointed that “after several years of educating and training many contractors about the severity of duct leakage, we are still finding significant amounts of duct leakage in the homes.”

FSEC also says that even if contractors do a good job of sealing the ductwork, the air-handling cabinet they purchase from the manufacturer can be leaky.

According to the center, a leaky air handler in the garage can draw in car exhaust fumes or toxins from chemicals stored near it. According to the study, the average installed air-handler cabinet allows 6% of the system’s airflow to leak in from the garage or attic. The best location for the entire system, ducts, and air handler is in a conditioned space, according to the study.

“Most homeowners, even those who recently moved into new homes, may be well advised to take advantage of any utility or independent duct-sealing programs,” said Withers.

Publication date: 05/06/2002

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