G3.1.1 exception c stating "For Laboratory spaces with a minimum of 5000 cfm of exhaust, use system type 5 or 7 that reduce the exhaust and makeup air volume to 50% of the design values during unoccupied periods.
Could you please clarify whether this 5000 cfm for individual system or sum of all the system exhaust air?
Please send the link which will have more detailed about this.
Thanks & Regards
Ramesh Narayanan
Marcus Sheffer
LEED Fellow7group / Energy Opportunities
LEEDuser Expert
5900 thumbs up
November 22, 2011 - 12:13 pm
It is based on the total exhaust for lab spaces in the building. So it is the sum.
Ramesh Narayanan
95 thumbs up
November 23, 2011 - 1:54 am
Thanks Mr.Marcus. Here this project having both Lab as well as office area. Normally System 3 or 4 has to select for this building (1.e less than 75000 sq.ft and less than 3 floors). Due to exception d for Lab we could select System 5 or 7. Could you please inform me whether the office area can be modeled with system 3. With exception c also the system need to be select system 3 for differ in process load. Pls confirm.
Marcus Sheffer
LEED Fellow7group / Energy Opportunities
LEEDuser Expert
5900 thumbs up
November 23, 2011 - 9:08 am
Use the system from Table G3.1.1A for the rest of the building. The exception would only apply to the lab spaces. If any other space qualifies for an exception it can be applied.