For determining the baseline system type, 90.1-2007 Appendix G, G3.1.1 list exceptions for determining the baseline system type. Exception (b) states that spaces with a peak thermal load that differs by 10 Btu/h*ft2 or more from the average of the other spaces served by the system are to be on a separate single zone system.

My question is about the word ?served?. Are plenum and unconditioned zones on the system to be included in determining the average peak load? These spaces aren?t really ?served? by the system.

I supposed plenums could be considered as served if the return air path is through the plenum?

Or do I assume all spaces on the system are ?served? regardless of the space type (conditioned, unconditioned, plenum)?

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Christopher Jones, P.Eng.
Senior Engineer

WSP Canada Inc.
2300 Yonge Street, Suite 2300
Toronto, ON M4P 1E4
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