I have 9 foot ceilings with all ducts/vents in the ceiling (none in floor).
Does the same rules apply for reversing fan blade rotation in winter??

You really don't need to reverse the fans unless you want to. You can circulate air either way, the only benefit of reversing is you may get less of a draft. Other than that, look at the placement of the fans versus the placement of the vents to figure out which pattern makes for more effective circulation.

Check out sections I, II, and X here and let me know what you think:

http://www.ceiling-fans-n-more.com/ceiling-fan-faq.php