DIY Blast Gate, 4 inch diameter, Laser Cut Edition: We have made available the PDF of our first version of exhaust and dust collection blast gate, lased from 1/4″ MDF and a piece of paper and a bunch of 1″ 6-32 machine screws. It’s made for use with 4″ dia. schedule 1 PVC irrigation pipes. …

Overview: This is what we call the stage 3 Large Particulate Filter where the raw laser fume is first mechanically filtered. It employs an easily procurable and economical 16 x 25 x 1″ disposable HVAC filter. We use MERV 13 that can be ordered on Amazon in bulk (or equivalent 3M filters as they do …