[Bldg-sim] Negative pressure for EQ cr 5
James V Dirkes II, PE
jvd2pe at tds.net
Wed Oct 6 12:36:37 PDT 2010
Personal opinion:
. 5 Pa is difficult to (accurately) measure
. 1 Pa is impossible outside of a lab
I don't know what they were thinking when making these requirements, since
they're not too clear, but I suspect that if you demonstrate .5cfm / sq.ft.
and no recirculation you'll be OK.
The Building Performance Team
James V. Dirkes II, P.E., LEED AP
1631 Acacia Drive NW
Grand Rapids, MI 49504
616 450 8653
From: bldg-sim-bounces at lists.onebuilding.org
[mailto:bldg-sim-bounces at lists.onebuilding.org] On Behalf Of Deepa
Sent: Wednesday, October 06, 2010 2:59 PM
To: Bldg-Sim
Subject: [Bldg-sim] Negative pressure for EQ cr 5
Hello all,
One of the requirements for EQ Credit 5 is to prove that the areas such as
the janitor's closet need to be negatively pressurized to a minimum of 5Pa
when doors are closed and 1Pa when doors are open. Generally, in mechanical
drawings, the cfm values are mentioned for exhaust fans.
I wanted some insight as to how this pressure difference information can be
obtained for both cases. Is there a straightforward calculation?
Thanks,
Deepa
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