Indoor Fume Extraction

[mike wallis]

Hello all. I wanted to see if anyone could steer me in the right direction on an indoor fume extraction system. We have been using CO2 lasers for about 20 years where we vent outdoors but with our new location we will need to filter the air before it goes outside. Anyone have a recommendation on a reasonably cost fume extraction system where the filters don't effect the bottom line to much? Anyone ever made a filter box and used it in conjunction with a dust collector?
Also how long do the filters typically last? For reference, about 45% of our engraving is granite, 30% Thermark, 5% acrylic, 10% anodized alum and 10% engraved wood (No vector cutting wood). We currently have an Epilog helix and Trotec speedy 300.

Thanks for any feedback!