Wikipedia definition for Duct Leakage Testing:
A duct leakage tester is a diagnostic tool designed to measure the air tightness of forced air heating, ventilating and air-conditioning (HVAC) duct work. A duct leakage tester consists of a calibrated fan for measuring an air flow rate and a pressure sensing device to measure the pressure created by the fan flow. The combination of pressure and fan flow measurements are used to determine the duct work air tightness. The air tightness of duct work is useful knowledge when trying to improve energy conservation.
A basic duct leakage testing system includes three components: a calibrated fan, a register sealing system, and a device to measure fan flow and building pressure. Supply registers or return air grills are sealed using adhesive tapes, cardboard, or non-adhesive reusable seals. One register or return is left unsealed, and the calibrated fan is connected to it. Pressure is monitored in one of the branches of the duct work while the calibrated fan delivers air into the system. As air is delivered into the duct work, pressure builds and forces air out of all of the openings in the various duct work connections or through the seams and joints of the furnace or air-conditioner. The tighter the duct work system (e.g. fewer holes), the less air is needed from the fan to create a change in the duct work pressure.
A duct leakage test can be performed by either pressurizing or depressurizing the duct work. Duct work that is outside the building envelope, such as in an unconditioned attic or crawlspace, should be pressurized so as to not bring in unwanted contaminants such as dust.
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What is an Energy Star Home?
To earn the ENERGY STAR, a home must meet guidelines for energy efficiency set by the U.S. Environmental Protection Agency. These homes are at least 15% more energy efficient than homes built to the2004 IRC and include additional energy-saving features that typically make them 20–30% more efficient than standard homes.
And with homebuyers increasingly interested in green building, energy efficiency is the place to start. That's because the energy used in homes often comes from the burning of fossil fuels at power plants, which contributes to smog, acid rain, and risks of global warming. So, the less energy used, the less air pollution generated. And the easy way to make sure a new home is energy efficient is to look for the blue ENERGY STAR mark, the government-backed symbol for energy efficiency. Learn more about how building Green starts with Energy Star blue.
Compared with standard homes, ENERGY STAR qualified homes use substantially less energy for heating, cooling, and water heating-delivering $200 to $400 in annual savings. Over the average 7 to 8 years you may live in your home, this adds up to thousands of dollars saved on utility bills. Additional savings on maintenance can also be substantial.
- · ADDED CONFIDENCE
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What are families saying about their ENERGY STAR homes?
More than 1 million ENERGY STAR qualified homes have been built in the United States. Last year, families living in these homes saved more than $270 million on their utility bills, while avoiding greenhouse gas emissions equivalent to those from 370,000 vehicles. Hear their stories and learn about what makes living in an ENERGY STAR home so special.