There is a company called Adflo that makes one of the best assembled parts working helmet/face shield/filter systems out there. That Triton unit looks pretty good too. Price shopping really helps.

NEVER GRIND steel/iron into any kind of air collecting/filtration unit that contains aluminium. Read about thermit. Even wetting your pants while running for your life will not put out this kind of fire. Plus the expansion coefficient of the gasses is pretty big.

Keep your filter units separate for wood/dusts and metals or preferably outside the building. Explosions happen to people who aren't paying attention.

These sorts of things don't happen in half mask or face mask respirators.