AutoCad MEP?

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Very basic questoin, is MEP an add-on for AutoCad? or a different and separate software?

I heard that it is the most widely used among HVAC engineers. If someone can explain the difference between the two, if any, i will be grateful.

Thanks guys!

Scott

[Norts]

you can find more information about MEP at the link below:

http://www.pugh.co.uk/Products/autodesk/autocadMEP-2008.htm

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Thank you Norts,
Love your soccer team btw