[QUOTE]Originally posted by dash
Supply air to a room will pressurize the room. A return from the room provides a path back. Central return and relying on transfers out of rooms CAN get enough air into the room which CAN displace air out of the room.Originally posted by RoBoTeq
Like I have been stating; "no air in, no air out."
Where did you state that,not that it's correct?
I thought you said,
"The return air portion of an HVAC ducting system does not "pull" or "suck" air...it allows the higher pressure of air introduced into an area to "return" to the units blower."
which is saying the supply air pressure "pushes" the air back to the blower,which you have said before.
The higher pressure air in the supply duct,after entering the room ,doesn't have anywhere near the ASP to push or return the air back to the blower.
Will displace through the transfer method, could displace out of the conditioned space as well.
The area adjacent to the central return will be a localized negative area, air will take the least path to get there. Technically it is a PD pushing air to the return.
Air into the central return can come through the ceiling from the attic, come from the hall way, wherever it is easiest.
Best system is returns from all areas but bathrooms and kitchens etc.