[EnergyPlus_Support] Should I model the plenum?

[kir kumar <kirank209@xxxxxxxxxxx>]

Dear Mike,
    I have got a huge building with 7 floors, each floor is having a plenum. All the return air from the zones enters the plenum before entering the air handling unit in the mechanical room and this happens for every floor. One side of the  air handling unit sucks the return air from the plenum and sends fresh air from its other end into the supply duct as supply air to the zones.
      My questions are 
  1. Should I model plenum as a separate zone?( I am actually using ep quick to build my zones but unfortunately ep-quick does not have the capability of building plenums)
  2. Should I just ignore the plenum and treat it as return air duct which carries return air from zones to the air handler in mechanical room?
 
Can any one help me with those questions?
  thanks in advance,
kiran

 				
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