If your doing manual J, D, S, and T on the the homes you are doing now and your installers know how to do a high quality install and seal the ducting your well on your way. Understand ASHRAE 62.2, charge your system by SH and SC and know how to use a manometer, multi meter and flow hood, record all the info for your HER's guy and your done!
My question is how was the transition? How many hours is 3.0 adding to a new construction home?
If you aren't doing any of this now.............................Well thats another story.
The 20% room cfm or pressure differential is no issue if you followed the manual's.
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