Credit Interpretation Request

Pro-rata for ventilation rates

Credit Interpretation Request Number


Where there is more than one Air Handling Unit in a single plant room that receives outside air, the outside air per Air Handling Unit may be pro-rated. The total outside air supplied to the plant room is to be pro-rated per Air Handling unit based on the total airflow of each Air Handling Unit, and respectively allocated. The following calculation must be used to demonstrate compliance with relevant credit criteria:

Fresh Air Per AHU = ( AHU Supply Air/Total Supply Air) x Total Fresh Air

In order to demonstrate compliance with the above methodology, the Short Report must show the calculations completed demonstrating compliance with the above methodology and relevant credit criteria. The design must just ensure that fresh air can be evenly distributed between the various AHUs.


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