ASHRAE Updates Indoor Air Quality Standard
ANSI/ASHRAE Standard 62.1-2013, Ventilation for Acceptable Indoor Air Quality, combines the 2010 standard and 10 published addenda to that edition. ASHRAE says this consolidated standard increases clarity and flexibility.
Roger Hedrick, Standard 62.1 committee chair, says the changes will allow designers and building operators to meet the standard’s requirements and provide adequate ventilation airflow to occupants while reducing excess ventilation and energy use.
Significant changes include:
- Table 6-2, Zone Air Distribution Effectiveness is modified to increase the ventilation effectiveness of underfloor air distribution systems that meet certain conditions.
- Requirements for the quality of water used in humidification systems are modified and clarified.
- Building level pressurization requirements are clarified, including adding a definition of “exfiltration.”
- A performance alternative to the prescriptive exhaust rates is added. This approach differs from the Indoor Air Quality Procedure, the existing performance-based method for setting supply ventilation rates, in that monitoring of the concentrations of contaminants of concern is required and provides the basis for control of exhaust flow rates.
- Some changes to the ventilation rates and space types in Table 6-1 are made. These add refrigerated warehouses and change the ventilation rate for sports related spaces to include a per occupant component which then allows the use of demand controlled ventilation in these spaces.
- The filtration requirement on air entering wetted cooling coils has been modified to change the MERV rating from 6 to 8. This change will reduce potential for particulate deposition on the coils that could lead to biological or other contamination on the coils.
- Toilet exhaust air that is cleaned to Class 1 may be recirculated.
The cost of ANSI/ASHRAE Standard 62.1-2013, Ventilation for Acceptable Indoor Air Quality, is $79 ($67 ASHRAE members).
Earlier this month ASHRAE debuted an updated standard for energy use in buildings that is up to 50 percent more stringent than the 2004 version. ANSI/ASHRAE/IES Standard 90.1-2013, Energy Standard for Buildings Except Low-Rise Residential Buildings, incorporates 110 addenda, including major changes to requirements for building envelops and lighting.
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