The role of HVAC air filtration and LEED certification protecting HVAC equipment and minimizing energy consumption. That’s why the right filter media strategy can help buildings become more environmentally sustainable and meet LEED and other green building rating system criteria.
Select the Right Filter
Building project managers pursuing LEED® (Leadership in Energy and Environmental Design) certification need to evaluate many things relating to energy efficiency, water efficiency, indoor environmental quality and related materials and resource selection. But did you know that choosing the right air filter also can be an integral part of a building’s environmental sustainability strategy? In fact, implementing the right HVAC strategy could net you up to 11 LEED credits.
Air Filtration for IAQ and Energy Efficiency A building’s HVAC air filtration system provides tangible ways to improve indoor air quality (IAQ) and energy efficiency – two main tenets of the LEED program. In addition to contributing to 56
Ops Talk • Fall 2013
the completion of LEED credits and prerequisites, careful selection of the right HVAC filter and filter media can actually save money in the long run – answering critics’ charges that green buildings always have to cost more. Effective air filtration provides the primary defense for building occupants and HVAC equipment against particulate and gaseous pollution generated within a building, as well as pollutants from air drawn into a building by the HVAC system. At the same time, air filters play a significant role in the energy consumed to operate the HVAC system. The higher the filter’s resistance to air passing through it, the more energy is consumed to operate the HVAC system. But even though we speak of air filters, it’s really the filter media that has the biggest effect on providing clean air,
To understand how the right filter can help to achieve LEED prerequisites and credits, it’s important to understand how filters should be selected to meet IAQ and energy-efficiency requirements. One of the biggest factors is filtration efficiency, which defines how well the filter will remove contaminants from air passing through the HVAC system. The American Society of Heating, Refrigerating and Air-Conditioning Engineers (ASHRAE) has an HVAC filter test standard to quantify the efficiency of filters. The ASHRAE 52.2 test standard measures the fractional particle size efficiency (PSE) of an HVAC filter. This indicates the filter’s ability to remove airborne particles of differing sizes between 0.3 and 10 microns in diameter. A minimum efficiency reporting value (MERV) is assigned to the filter media depending on the PSE in three different particle size ranges: E1 (very fine particles in the 0.3 to 1 micron range); E2 (fine particles in the one to three micron range); and E3 (coarse particles in the three to 10 micron range). A MERV rating of five is least efficient, while a rating of 16 is most efficient. For the best and most complete way to compare the filtration efficiencies of different air filters, review the efficiency values that are included in the ASHRAE 52.2 test report.
