There is certain language in the prerequisite description that appears to apply to a specific type of HVAC system that is not present in this building. Specifically, the language stating that each "air handling unit in the building must comply with either Option A or Option B" assumes that all buildings have air handling units. This building does not have air handling units. The design is that of approximately 150 heat pumps with individual zone temperature control and ducted outside air through a single make-up air handling unit located on the roof. On each floor there is a takeoff from the main outside air riser with a ducted outside air distribution loop that delivers outside air to each heat pump. Verifying the outside airflow at each heat pump, as if each heat pump is an independent air handling unit, is cost prohibitive and places our LEED application at an undue disadvantage in comparison with a building with contemporary variable air volume (VAV) air handling units or other zone level control. Furthermore, the use of the terminology of air handling unit being the primary source of outside air is in conflict with the description under option A that provides for verification of "each outside air intake, supply air fan AND/OR ventilation distribution system to supply at least the outdoor air ventilation rate required by ASHRAE 62.1-2007." We believe that the terminology that is applicable in the design of the HVAC systems at these buildings is more consistent with Option A verification requirements, i.e., ventilation distribution system. Furthermore, the requirement for verification of outside air ventilation at each "air handling unit" would not apply since it represents an inconsistent requirement for buildings with heat pumps versus a building with floor level air handling units and zone level terminal VAVs. We request that the following scope of services be considered an acceptable procedure for outside air verification and satisfaction EQ Prerequisite 1. 1. Perform duct traverses at the takeoffs from the main outside air makeup unit supply riser. The traverse shall provide data on the outside air velocity pressure and airflow (CFM) for the ducted "ventilation distribution system" that delivers outside air to the terminal heat pumps. These measurements shall be performed on every floor ventilation air distribution system (9 floors per building). These measurements shall be performed with the 400 Brand make-up air VFD at 60 Hz at its normal operating condition (unit is constant speed without VFD). This approach will provide for 100% of the building outside air delivery on a floor by floor basis. It is believed that this approach is comparable to measuring outside air at a single air handler in a system design where each floor is served by a single air handler. 2. Perform airflow measurements at the main make-up air unit on the roof of building. The VFD shall be set at 60 Hz for the preliminary measurement. These measurements shall be displayed in a final report in a comparative manner with the summation of the individual floor level ventilation air distribution systems. 3. Perform pressure measurements across the fan and across various turns and obstructions prior to the building riser. The VFD shall be set at 60 Hz for the preliminary measurement. 4. Provide measurements of the exhaust air from the ducting for each of the restroom exhaust ducts on each of the 9 floors. 5. Perform airflow measurements at the main exhaust air unit on the roof. The VFDs shall be set at the typical operating speed and at 60 Hz. At both settings, on each of the exhaust fans, conduct airflow and pressure measurements.