Edit. Other brands with

[Coronita]

Edit.

Other brands with similar design principles… (No practical experience with them though)

Sakura range hoods. Supposedly better material than previous mentioned company

http://www.sakurausa.com/rangehoods.htm

Knock off of San Yang Pai
http://www.2pacific.com/

Also, some of the brands offer self-cleaning models, in which there is a pump that pumps 409 from a reservoir into the fans and drains them to a drain container.