Dirty condition fan

need a 12 volt small fan that can
withstand dusty conditions. please advise

The bearings that are more sealed should work better in a dusty environment.
Below is a link with parts to choose from.
12VDC fans

sorry, but what bearing is that. vapo ?

IP ratings are used to indicate resistance to environmental factors such as dust and moisture, and intrusion of foreign objects. I’d suggest looking at products with an IP6x rating, such as these.

I would consider the orientation in which a fan is to be operated a more relevant factor in choosing a bearing type than environmental contaminants. If the rotor’s horizontal with struts facing up, I wouldn’t consider anything but ball bearings. A fairly extensive discussion of fans and their selection can be found here.