|Type:||5-6-story apartment buildings, 300 units|
| City Mission:|| Reduce energy costs and improve indoor air quality for the Heritage Apartments.|
|Goal:||Reduce energy usage - increase indoor air quality.|
|Before Aeroseal:||900 CFM of leakage.|
|After Aeroseal:||30 CFM of leakage.|
|Results:||Eliminated leakage in all 75 shafts.|
In late 2010, the city of Boston first announced plans to renovate the Heritage Apartments, a section 8 housing structure in East Boston. The complex consists of three separate five- and six-story buildings, which include nearly 300 individual apartments. A top priority for the renovation was to improve the energy efficiency and indoor air quality of the units.
A preliminary inspection found substantial leakage in each of the buildings’ 75 exhaust shafts. As a result, kitchens and bathrooms on the lower floors received little ventilation while upper floor units, those closer to the rooftop exhaust fans, were over-ventilated. The leaks were not only responsible for inadequate ventilation but also lead to higher fan usage and thousands of dollars in additional energy costs associated with running these fans at higher speeds.
Engineers on the project were familiar with Aeroseal, a duct sealing technology that works from the inside of ductwork to seal leaks. It was clear to them that, short of tearing down existing walls to access the individual shafts, this new technology offered the only viable solution to their duct leakage problem. So the work contract specified the use of Aeroseal.
It took Aeroseal of Maryland less than a month to seal all 75 exhaust shafts. Post-sealing tests showed that Aeroseal reduced leakage by 90% or more, allowing the engineers to dramatically improve the buildings’ ventilation, while reducing energy consumption.