For those of us not using your in-house filter system, what do you see as the minimum CFM of air flow is required for the adequate removal of gases from the Glowforge?
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Even without the add-on filter, the Glowforge has a built in fan and fume extrator.
All you will need is a window to vent it out of.
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Also,
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@jkopel speaks from experience as I believe he has a hose hanging out his window. 
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