Hi, I need to get a respirator with full face mask and and airline. It will get used for processing dry gourds from the garden as well as other things. And I seem to remember that some people on the list are involved in industrial level safety precautions, so I thought I'd ask. The ones with the nose and mouth covering and disposable filters don't allow enough oxygen through for me. What kinds are good to get? I think I'd like one that I can plug in so I am not always having to get new air tanks, but have never used anything like this before, so welcome advice as to how to choose. Sharon gordonse@one.net