If you use this method just be mindful of the potential for embers and sawdust dancing together… It can be quite a sight if not attending to it… You could probably do the same with a damper/duct fan and avoid the combustibles.
Something like this, for instance…
Spider Farmer 4-Inch Inline Duct Fan, 205 CFM with Speed Controller, Quiet EC Motor Ventilation Exhaust Fan for Heating Cooling Booster, Grow Tents, Hydroponics