We are working with a very large commercial building with many tenants and pursuing LEED EBOM. Full floor tenants own, operate and maintain their own self contained air conditioners (300+ units). These units have OA intakes incorporated into each unit. Does anyone know if we need to include tenant owned units in the ASHRAE analysis for this prerequisite? Thanks.
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Tristan Roberts
RepresentativeVermont House of Representatives
LEEDuser Expert
11477 thumbs up
July 13, 2010 - 12:14 pm
Yes, you do. This prerequisite applies to the whole building, tenant spaces included.
Rafael Negron
PrincipalNorgen Consulting Group, Inc.
9 thumbs up
July 13, 2010 - 12:19 pm
Thanks for the response. Seems like a bit of a dilema considering building management has no control over how the units are operated and how the OA dampers are set or maintained. I would have thought these units would fall under LEED for Commercial Interiors (but I'm not too familiar with the specifics of that program). Thanks again.
Tristan Roberts
RepresentativeVermont House of Representatives
LEEDuser Expert
11477 thumbs up
July 13, 2010 - 12:30 pm
LEED-EBOM is for operations in a whole building. It is definitely a more challening proposition in a building with multiple tenants, some of whom possibly not interested in the LEED process, but it has been and can be done.The importance of it being the whole building is that the public needs to understand, on seeing the LEED plaque in the lobby, what exactly is LEED-certified. If some tenant spaces were included but not others, that would be potentially misleading.LEED-CI is used on renovations or alterations of single tenant space. Look up the LEED rating system selection policy for more.
Rafael Negron
PrincipalNorgen Consulting Group, Inc.
9 thumbs up
July 13, 2010 - 12:53 pm
Understood. Thanks again for your input.
Patty Breech
Sustainability ConsultantUHG Consulting
16 thumbs up
September 16, 2010 - 5:26 pm
I have a similar question -- we are seeking EBOM certification for a hotel with 100+ rooms, each of which has its own packaged terminal air conditioning (PTAC) unit. The operation of this unit is completely up to the guest's preference. There is no way for hotel management to ensure that each is delivering the required minimum of outside air. Some guests may choose to never turn it on at all. Does that preclude us from earning this prerequisite?
Jenny Carney
Vice PresidentWSP
LEEDuser Expert
657 thumbs up
September 16, 2010 - 5:39 pm
Patty,
In my experience, most hotel rooms will have exhaust fans running continuously, meaning that air is either infiltrating from the hallway or somewhere.
In the case of makeup air from the hallway, you can show compliance by adding the guest floor area to the calculations for the AHU dumping air into the hallway.
A project I worked on had makeup air coming directly from a vent in the wall (the building was located in a lovely climate), so their strategy for showing compliance was to measure CFM at the main exhaust stack, and show the air coming out was greater than or equal to the OA required by 62.1 when the distribution system was set to reflect that OA was being pulled across the room by the exhaust fan.