I was planning on going the supplied air route but in the end decided to buy a standard helmet and just use a respirator.
I have a 3m 7500 series half mask but unfortunately it's slightly too large to fit under my helmet even if I remove the prefilters. I found the GVS elipse and the moldex 5000 which look lower profile and come with ABEK1 filters. I'm not even sure what level of filtration is needed for welding, I have read many different things. If the round P100 filters are sufficient then they will fit ok with my current mask but I'm not looking to take any chances.
I have a 3m 7500 series half mask but unfortunately it's slightly too large to fit under my helmet even if I remove the prefilters. I found the GVS elipse and the moldex 5000 which look lower profile and come with ABEK1 filters. I'm not even sure what level of filtration is needed for welding, I have read many different things. If the round P100 filters are sufficient then they will fit ok with my current mask but I'm not looking to take any chances.