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News Bits and Pieces -
October 10, 2006
The role of an existing infiltration credit in ASHRAE’s residential ventilation standard is open for public comment.
ANSI/ASHRAE Standard 62.2-2004, Ventilation and Acceptable Indoor Air Quality in Low-Rise Residential Buildings, provides the minimum requirements necessary to achieve acceptable indoor air quality for dwellings.
Proposed addendum j would eliminate the section describing the infiltration assumptions that are present in the standard.
Some feel that the section is often misinterpreted by code officials who use it to require more mechanical ventilation than is currently required in the standard in new housing, David Grimsrud, chair of the Standard 62.2 committee, said. Also, the requirement could imply that new houses are as tight as they ever will be and that new housing should be leaky enough to provide the amount of infiltration suggested.
Also open for public comment is proposed addendum k, developed in response to recent studies of window opening patterns in California. The study was done in the region included in an existing exception of the standard. The study has shown that household residents open windows much less than expected.
Also, an addendum that would extend BACnet to support access control systems is being proposed by ASHRAE.
ANSI/ASHRAE Standard 135-2004, BACnet—A Data Communication Protocol for Building Automation and Control Networks, is the only open, consensus-developed standard in the building controls industry.
Proposed addendum f to Standard 135 establishes a standard BACnet object, which represents a door operated as part of an access control system. It presents information and alarms about the door such as its status (open or closed, door open too long, door forced open), and provides means for controlling the door (lock, unlock, etc.), according to Bill Swan, chair of ASHRAE’s BACnet committee.
The proposed addendums will be open for public review until Nov. 6. To review the proposed addendums or to comment, visit www.ashrae.org/publicreviews.
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