Came across while researching how to minimize exposure risk to isocyanates, methyl amines, wood dust, paint pigments, and microballoons. Its called hobbyair and is a well priced supplied air respirator. Organic respirators and dust masks never seal perfectly but with a supplied air respirator you don't need to worry as much because the air flows away from your mask (positive pressure).
Check it out. Expensive but well worth it my opinion. We use very dangerous stuff. I just ordered a half mask set up with a tyvek hood for spraying clear.