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Qhr = Qhs + Qhdu + Qhi

Where:

 

 Qhr        = Total heat loss per room, Btuh
 Qhs        = Heat loss due to structural components, Btuh
 Qhdu        = Heat loss due to ductwork, Btuh
 Qhi        = Heat loss due to infiltration, Btuh

 

Ref: Manual J 8 - Page 2-3