Can any one tell me how to assemble different parts of duct fan , such as (fan , duct , and different nuts)

Hope this pics helps you in assembling of Duct Fan. Fan and Prop adopter will be mount on motor shafts as normal.

Pl post pics of your Duct Fan , so we can advise you better.

this is my edf and i have flyfly hobby model FF3-308 motor