We are a residential project with 610 residential units, each of which is independently ventilated with a constant volume ventilation system consisting of an Energy Recovery Ventilator (ERV) that delivers 100% outdoor air. Providing outdoor air intake flow monitors for each system is excessive in this case because for smaller systems, there are no standard manufacturer monitoring device options and it is likely that the occupants of the space would readily recognize system failure. For these reasons, the project team would like to inquire if we are required to meet the monitoring requirements of this prerequisite. If so, are there alternative compliance paths available for residential projects and/or for projects with smaller ventilation systems?
Outdoor air intake flow monitors are not required for small systems (systems with an outdoor air intake flow of not more than 1000 cfm (472 L/s)) if the system is balanced per ASHRAE 62.1-2010, section 7.2.2 and the maintenance plan for EA prerequisite Fundamental commissioning and verification meets the requirements of ASHRAE 62.1-2010, sections 8.4.1.2 and 8.4.1.6 and includes preventative maintenance measures for the system (for example: clean, lubricate, repair, replace, or adjust components as needed).