Adding In Line Fans To LaserBox


I just got my Laserbox and after my first large acrylic run, I believe the internal fan needs some help. I’m looking at adding an external inline fan (like many do for their Glowforge), and I’m wondering where I should place it for best effect…between the laserbox and the purifier or between the purifier and the exhaust window.

I also noticed that the Laserbox has large panel gaps around the door that let smoke out. Would it be at dangerous to seal/add rubber to block the gaps?