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7carisfast (Electrical) (OP)
2 Oct 07 22:05
Are there any industry recommendations for pressurizing a MCC Room with HVAC and fresh air make-up?  Would I being assuming too simple of a system with a closed-loop AC system with a fresh air fan which provides fresh air and positive pressure, maybe controlled via a VFD and a pressure transmitter.  I would also assume 0.5 inches of pressure would be sufficient.
ChrisConley (Mechanical)
10 Oct 07 15:21
Well, 0.5" of differential pressure would be more than sufficient for pressurization. Even 0.1" would be adequate.

How big an MCC room? What is the requirement for pressurization?

I'd recommend cross-posting this over to the HVAC forum:

http://www.eng-tips.com/threadminder.cfm?pid=403
schola (Mechanical)
16 Nov 07 14:34
I have not seen any industry standard advising MCC or Control Roomoom Pressurization value.

Normally, the pressure level is obtained from pressurizator manufacturers index,or trough  basic practices coming from enginnering consulting and/or installing firms.

The "standard" pressurization value ranges from 0.05 to 0.15 "H2O.

Take in account, the wind speed an incidence angle over windows, doors and cracks belonging to the MCC room.

Regards,

schola

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