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Here is the model and link T300MVi - dimension 104x222x50inches http://www.toshiba.com/ind/product_display.jsp?

Is there a possibility that the electrical equipments need a positive pressure to operate properly?

Now,checking back my A/C unit capacity. Assuming exhausting all the 15000cfm from the VFD to outside. Do you think 6 ton A/C unit will be good enough to cool the room.

The air is filtered through built in filters in the VFD unit

First,I want to be sure about the recommended positive pressure for such a room? Is their a formula to calculate?and how to maintain this. Any other design or control options?

There are air blowers (intake fans) which are blowing external air to the room. The vfd has a rectifier and a transformer(this is the source of heat). Exhaust louver to be used to discharge the air outside the room,and an intake grill to be used to recerculate it through the room.

Well,I checked the specs. of the VDF --and it produces 15000cfm. I have to explain more ..the room has an external door of 4' x 9' and internal one of 4'x9'.The external temp. is ranging from -2C to 40C. There is another sourse of leakage which is the louvers of the intake fan. Please tell me...

You are right,let me check this back with the supplier.I guess it has to be 15oo cfm(not 15000cfm)

Yes, the 15000cfm will be used during winter in heating the VFD room,While during summer it has to be exhausted from the room.It can be also 50% exhausted and 50% blown into the room in certain times.

The 15000cfm is produced from the VFD itself and is blown into the room where the vfd exists. Thanks

I am working on the design of HVAC system for a VFD room, which is a part of a modular building. My main concern is to apply positive pressure inside the VFD room. How do I achieve that and what is the recommended positive pressure? VFD produces 15000cfm hot air. Room Dimensions are...