Blower door test for 1 in 7 of each room model

Hi, I was wondering if the v2.2 option (HERS methodology) would still apply for v2009 in regards to the blower door test and number of units that must be tested. I read once that you could test only 1 in 7 similar units (same layout). My project is both a hotel and residential building, and there are different types of apartments and hotel rooms which are obviously repeated throughout the building. Just as an example, if I had 3 different types of hotel rooms with 10 units each, I would have to test only a total of six units. Can we still do this and comply with the prerequisite requirements? If anyone can come up with the official source of this info I recall I'd be glad to hear it. Thank you.