My need for a respirator comes from using different paints and resins around the room. The manufacturers of these products recommend a quality respirator and as my last respirator was badly scratched and had a broken strap I went with the UOPASD. The item was delivered quickly by Amazon and unpacking was easy. I installed the round canister as it meets the criteria and was designed for the UAPASD gas mask. The mask did not fog up and I could breathe normally. In an emergency, I was able to quickly remove my mask. The mask was tested by applying resin to a wooden surface. The resin I applied wasn't the most toxic, but I wanted to test the mask. It worked well and I had no ill effects when trying to apply the resin without the proper equipment.