I'm going to replace my en-suite exhaust fan and some old side sheet.
After remove the old fan, I saw the hale in ceiling as:
http://www.flickr.com/photos/90550088@N05/8226048021/
And after remove some wall sheets, I can see the back side (wall of master room) as follows.
http://www.flickr.com/photos/90550088@N05/8227093468/
Does it contain asbestos? safe to DIY?