Hello, I am trying to make a vba excel application to make load calculation to cold rooms.

I am following ashrae 2006 load calculation indications, but i do not get to match infiltration load with other soft load calculation like TRENTON or CALC-RITE (are they the same company?). Neither with the ashrae example. I think it is because I missunderstand the doorway time factor or the Gosney&Olama expresion although it is so easy to apply the ecuations...

May somebody help me and try to explain me about how to apply the doorway time factor corretcly?

Thank you.