Exhaust from laser cutters contains smoke and fumes that range from annoying to hazardous depending on the material being cut. Sending the exhaust outside is the most common approach, sorry neighbors!
I will be taking the slick new Full Spectrum 5th generation laser on the road to a couple of upcoming events at which ducting to the outside will not be possible. Commercial air purifiers costing upwards of a couple thousand dollars are a bit out of my price range.
There are a few designs for DIY versions floating around the internet, here's my first attempt at building one on a budget:
Starting with a small metal barrel for the enclosure ($10 at a local salvage yard),
Aluminum screen stapled to two rings cut from 3/8" plywood, held about 6" apart with some 1/4" bolts served to contain about 20 lbs of activated charcoal (available on ebay for about $60) that was put in first.
I had a quiet inline fan that moves about 250 cfm laying around which I placed in a hole cut in the lid. Similar fans are available for around $100. I still need to secure the fan to the lid and seal the seam a little better with caulking and or tape before I try to cut acrylic, but the first run told me that it will work just fine for my immediate needs cutting cardboard goodies!
Now, where to spend all the money I saved?????