To protect occupants’ health by reducing particulate matter from the air supply system.
Install air filters with a minimum efficiency reporting value (MERVMinimum Efficiency Reporting Value (MERV) rating is an American Society of Heating, Refrigerating and Air-Conditioning Engineers (ASHRAE) measurement scale which rates the effectiveness of air filters. ) of 8 or higher on all recirculating space conditioning systems, per ASHRAE 62.2–2010. Design ductwork and specify the central blower to account for the pressure dropPressure drop is a decrease in pressure from one point in a pipe or tube to another point due to a restriction or length or diameter of the pipe or tube (resistance to flow). across the filter. Air filter housings must be airtight to prevent bypass or leakage.
Nonducted systems are exempt from the minimum MERV 8 requirements but must have an internal air filter in the air-handling unit.
Install air filters rated MERV 6 or higher for mechanically supplied outdoor air for systems with 10 feet (3 meters) of ductwork or more, per ASHRAE 62.2–2010, Section 6.7.
Projects may use equivalent filtration media class of F5 or higher for MERV 8 and G4 or higher for MERV 6, as defined by CEN standard EN779—2002.
Projects that earn the EPA Indoor airPLUS label automatically meet the requirements of this prerequisite.
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