Welding helmet forced air

thingiverse

Forced air system for Shermar V5A helmet (helmet already has mounting points that can be used for air inlet), mainly to combat fogging, also helps with dust ingress then grinding, but use at your own risk in such conditions. Uses 3M bayonet style filters and Makita 18V LXT batteries. Other parts: 1x Sei B9733B12UP-A fan 1x 12V 3A out DCDC converter 1x 10x15mm rocker switch 1x Optional 15mm potentiometer & electronics for fan speed control 1x Makita battery terminal (Mfg. no. 643852-2 or [one by mojo_replica](https://www.thingiverse.com/thing:863257)) 1x [Makita bettery holder by Henk_i3](https://www.thingiverse.com/thing:1857196) 2x [3M bayonet adapters by AgapeIngenium](https://www.thingiverse.com/thing:4245358) (needs only inner shell) 2x 3M TR-654 filter gaskets 1x 32mm vacuum hose 4x 2.2x6.5mm self tapping screws for helmet air inlet 4x 2.9x9.5mm self tapping screws for hose connector 4x DIN912 M3x16mm screws for belt loops 2x DIN7985 M3x35 screws for fan 4x DIN912 M3x25mm screws for lid through belt loops 3x DIN912 M3x10mm screws for battery holder 3x M3 nuts for battery holder 6x M3X5X4mm brass inserts for lid and fan