ASHRAE Proposes Alternate Compliance Path for Existing Buildings in IAQ Standard

September 8, 2014 By Karen Henry

ASHRAE Energy ManageASHRAE is proposing an alternate compliance path to ANSI/ASHRAE Standard 62.1-2013, Ventilation for Acceptable Indoor Air Quality.

Proposed addendum b is one of six addenda to Standard 62.1, which is cited frequently as a criterion for evaluating ventilation systems in existing buildings.

Section 6 (including the ventilation rate procedure) of the standard was developed as a design standard. As such, Section 6 and Normative Appendix A allow for many complex system designs and airflow pathways. The standard states in part that “the provisions of this standard are not intended to be applied retroactively when the standard is used as a mandatory regulation or code.”

Proposed addendum b provides an alternate path of compliance for those situations where information required to determine system performance is unavailable or for smaller facilities with straightforward multiple zone applications.

Proposed addendum c would revise the current definition of environmental tobacco smoke (ETS) to include emissions from electronic smoking devices and from smoking of cannabis. It also would clarify that provision of acceptable indoor air quality is incompatible with the presence of ETS, including cannabis smoke and e-cigarette emissions.

Addendum d adds an exception to Section 5.8 (Particulate Matter Removal). In sensible-only cooling, the equipment’s purpose is to provide only sensible cooling. A chilled beam is an example of this type of equipment. In this case, the coil surface would never be wet and the filtration requirements intended for wetted surfaces should not apply. Latent cooling for these systems would be provided by other portions of the system, such as cooling coils in the primary air stream, which would then have independent upstream air filtration.

Addendum e modifies Section 8, Operation and Maintenance, incorporating calibration requirements for airflow monitoring sensors and systems and harmonizes Table 8.4.1 (Minimum Maintenance Activity and Frequency) with ASHRAE/ACCA Standard 180-2012, Standard Practice for Inspection and Maintenance of Commercial-Building HVAC Systems.

Addendum p would allow the ventilation rate to be reduced to zero through the use of occupancy sensors (not through contaminant or CO2 measurements) for spaces of selected occupancy types.

Addendum q clarifies requirements in Section 5.2 (Exhaust Duct Location) to include air classes instead of descriptive language, and modifies the requirements by allowing positively pressurized exhaust ducts inside the space of origin.

The addenda are open for public comment from Sept. 5–Oct. 5, 2014, at


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