so, after you measure this, what are you going to do?

why not just do that? work on the solution, not just measuring how much problem --

eg: seal all the ducts & cracks with mastic
have dampers in the duct take-offs from the trunks
adjust dampers until all rooms are +/- 3F just after blower shuts down

it takes some patience to set dampers --
& may need different settings for summer & winter

[Edited by cem-bsee on 10-16-2005 at 10:19 PM]