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If my project is using air handlers that supply 100% outside air at a constant volume, do I still need to install an airflow monitoring device?

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CI-2009 IEQc1:Outdoor Air Delivery Monitoring

Non-Densely Occupied Spaces Served by Existing AHU

If you have non-densely occupied spaces served by an existing AHU, how should the outdoor airflow measurement be handled? There is no baseline for when an alarm should occur on the ventilation air since not all spaces are within the LEED scope and no minimum ventilation rate has been calculated via 62.1. On our specific project, there are 10 floors served by multiple 100% outside air units. We are doing work on a very small portion of multiple floors. The units are not within our scope of work. Short of adding an alarm to each valve providing airflow to each renovated space, which would get very costly very quickly, what would qualify for this credit? We have no problem meeting the CO2 sensor portion of this credit.

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Dylan Connelly
Mechanical Engineer
Integral Group
LEEDuser Expert
342 thumbs up

Thu, 09/22/2011 - 15:20

What you have going for you is that the units are providing 100% outside air. That is much easier to monitor than minimum OSA fans. However, you would likely need an airflow station and alarm (or control wiring to a BMS) at each OSA entrance in order to satisfy the credit.

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