I am trying to Calculate the required Pressure Drop adjustment for a lab facility, using Addenda "p" from ASHREA 90.1-2007. The credit for "Fully ducted return and/or exhaust air systems is rasied to 2.15 in. w.c. for lab facilities. Does this number already include required filtration in the exhaust, and exhaust airflow control devices, or are those separatly added on to that 2.15 number?
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Marcus Sheffer
LEED Fellow7group / Energy Opportunities
LEEDuser Expert
5906 thumbs up
April 28, 2011 - 1:26 pm
No it does not already include the other components. They are added separately according to our interpretation of Table 6.5.3.1.1B.