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Baseline System Type Exceptions in 90.1-2007 Appendix G

4

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Fri, 11/12/2010 - 14:56

Yes it can apply to the situations you describe. These exceptions are optionally applied to individual projects.

Fri, 11/12/2010 - 15:35

Thanks Marcus, but what happens when both (c) and (d) apply? I guess you can look at it that when you separate the Exception (c) spaces as single systems, the exhaust rate would usually be below 5000 cfm. But what if there is a large lab suite on a single system, with greater than 5000 cfm of exhaust and also requiring special pressurization relationships and minimum circulation rates, where both Exceptions (c) and (d) apply? I have submitted an interpretation request into ASHRAE and will post the response.

Wed, 04/22/2015 - 15:59

I have a similar situation. What was the response to the interpretation request? What should be done when both exception (c) and (d) apply?

Wed, 04/22/2015 - 16:34

I just noticed my advise above is not correct. The exceptions must be applied to projects, they are not optional. If it is a lab space then apply d, if not apply c.

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