I just got back from a convention targeting a completely different market than most of us are used to - hydroponics. They, just like us, are concerned with noise and odor. Below are links to a few suppliers I found that might work for lasers and might not:
http://www.sharprichhk.com
http://www.phatfilter.com
http://www.canfilters.com
http://www.continentalfan.com
FYI, I'm not affiliated with any of them.