Ventilation Effectiveness - EQc2 Intent To provide additional outdoor air ventilation to improve indoor air quality (IAQ) and promote occupant comfort, well-being and productivity Requirements For mechanically ventilated buildings, demonstrate a zone air distribution effectiveness (E3) greater than or equal to 0.9 as determined by ASHRAE 62-2004 For naturally ventilated spaces demonstrate a distribution and laminar flow pattern that involves not less than 90% of room or zone for 95% of hours of occupancy The intent and requirements described on this webpage are paraphrased from the copyrighted works of the USGBC "LEED 2009 for New Construction and Major Renovations Rating System November 2008", and, the CAGBC "LEED Rating System & Addendum for New Construction and Major Renovations LEED Canada-NC version 1.0 December 2004", and are presented here strictly for informational purposes and are not intended to supplant or be used in place of the original copyrighted works.