Hello, we are doing our office project on a tenth floor of an office building. We have two fan coil units which supply outdoor air to the office. The Design Outdoor Air Intake Flow for both is over 20,000 cfm. The Outdoor Air Intake Flow calculation for AHU1 and AHU2 are both around 3500 cfm. To meet IEQc2 are around 7000 for AHU1and 10000 for AHU2.

The comment we received for IEQp1 is as following:

It is unclear what system is supplying the outdoor air to the LEED-CI project. The PIf4: Schedule and Overview Documents narrative appears to indicate that the project spaces are served by fan coil units (which appear to be delivering the outdoor air, mixed with return air to the project spaces). However, the VRP calculations provided have been completed for larger air handling systems that also appear to serve spaces outside the LEED-CI project scope, based on the design outdoor airflow stated on the form. Additionally, if these larger systems are providing ventilation to the project space, it does not appear that the spaces outside the project boundary have been accounted for in the ventilation rate procedure calculations, as required. The VRP calculations must be performed at the ventilation system level.

The TECHNICAL ADVICE is to provide a narrative describing the HVAC systems that provide the outdoor air to the spaces within the LEED-CI project boundary and to the rest of the building.

We know that the Design Outdoor Air Intake Flow is too large. However, this is the real situation. The two fan coil units are only serving the whole project. If this would influence the pass of the whole project? Could anybody tell us how shall we response to the reviewer?