Remember SAFETY first!
You need to go for the safety glasses. They are a must. There is many sites for getting it. Normally for the blue lasers they are red or orange color.
The enclosure with a fume extractor is also a very good idea, and for best safety a charcoal filter on the extractor is another security point.... Also you can build your full enclosure or add an enclosure window from plexiglass, the most used color for 445nm seems to be fluorescent transparent orange,
There are a few sites offering tested plexiglass color for best security.
Laser safety notes: http://en.wikipedia.org/wiki/Laser_safety
