an update from February 2011

This is the updated portion of IEQ c5. In mechanically ventilated buildings, each ventilations systems that supplies outdoor air shall comply with the following: o Particle filters or air cleaning devices shall be provided to clean the outdoor air at any location prior to its introduction to occupied spaces. o These filters or devices shall be rated a minimum efficiency reporting value (MERV) of 13 or better in accordance with ASHRAE Standard 52.2. o Clean air filtration media shall be installed in all air systems after completion of construction and prior to occupancy. Deleted Portion: "In mechanically ventilated buildings, install new air filtration media in regularly occupied areas prior to occupancy; these filters must provide a minimum efficiency reporting value (MERV) of 13 or better. Filtration should be applied to process both return and outside air that is delivered as supply air." Does this mean that only the AHUs will need MERV 13 to achieve this credit and FP-VAVs will not need MERV 13? Sounds like the return air filtration requirment had been eliminated. Any thoughts?