Sorry sport, the attic will always have negative pressure with the PV running otherwise you could not have a pressure gradient that forces air movement. The pressure gradient is a 3 dimensional field that will vary throughout the attic. While the mass flux entering and leaving the attic may be the same, this only happens with a pressure gradient. You are making assumptions about the geometry of the attic and where air will come from. Without modeling it, you dont know where is coming from. I dont believe you know more than the people who study this stuff for a living. You are are in over your head - I suggest you give it up.Originally posted by whos on call
I am not assuming. Everything in nature always attempts to take the easiest route in order to accomplish it's task.
In the case of replacing exhausted air, the air will be replaced by air that is closest in proximity, and in this case it will come from the nearest vent opening. Like I said , this is not my opinion, but it is a fact. Your not going to get negative pressure in a room that has equal inlet and outlet pressures, nor is the space under the attic going to try to compensate for exhausted air that is being replaced on a countinuous basis, by inlet air that is readily available close by.