I just bought one of these to replace my internal fan. The difference is amazing. Not only is it quieter but there isn’t a hint of smoke. Even when cutting Mdf all the smoke is pulled down and out.

I can go so much longer between lens / mirror cleanings and my issue of cuts that were further from the laser not cutting as well is gone.

https://www.amazon.com/dp/B00CAHM75W/ref=cm_sw_em_r_mt_dp_REMGFbQ3WACQK