I would tend to agree with the architect because they have the vision of the entire space. This is a discussion you should be having with him/her so they can explain why 10 feet is better, or they can adjust it to your preference.

i m starting my home at north west india so what will be sufficent height of lenter after that i will also use down ceiling design

Cornerstone Design, Thanks for your response. The electrician and false ceiling folks I've engaged are very competent, and are going to take care of installing the ceiling fans (of any type or kind I buy). My only task is to find and procure appropriate fans. Regarding the loss of about 10" due to the false ceiling: I only did a simple rectangular tray drop design for lights (approx 4-6"); however, the original ceiling was not straight, and approx 2-3" extra went in straightening it at the tray edges. Since the ceiling seems (perceived) low, I do not want to make it look lower visually. I am looking for fans that will be as close as possible to the false-ceiling without effecting its sweep functionality or energy efficiency. Any suggestions on where I can get good ceiling fans in Bangalore (all brands and varieties under one roof)? I would also like to see/consider the options you've mentioned (special fan like flush fan or ceiling swing fans). Where can I see/procure these in Bangalore? Thanks!

ideal floor to ceiling height is 10'.living room size 12'x16' or 14'x20' according to your requirement.