Previous versions of this document are available under the Product Family tab. ANSI/ASHRAE Standard 62.1-2010 supersedes Standard 62.1-2007. It is ASHRAE's standard for indoor air quality for commercial buildings. The 2010 revision adds new minimum filtration/air-cleaning requirements, minimum requirements for when ventilation systems must be operated, and a Natural Ventilation Procedure. Other revisions include a more robust IAQ procedure, demand-controlled ventilation system design requirements, requirements for separation of intakes and exhausts, and ventilation rates and occupancy categories. Keywords:ventilation, IAQ, indoor air qualityRelated Application: ASHRAE 62.1 iPhone application now availableThe ASHRAE 62.1 iPhone, iPod touch, and iPad application allows you to perform ventilation calculations for commercial buildings based upon Standard 62.1http://www.ashrae.org/iphone