The evaluation of a respirator is always subjective. I have no "objective measurements". But I get in dust and chemical nuisance air asthma and am therefore quite a good "indicator" for the detection of loads. First, the advantages: I use this mask remains in light and medium dust loads. She's better than all the measly "Only-flow masks" that never closes firmly against security. Here you have a mask with a perfect fit and excellent adaptability (perfectly flexible Kunsstoff - perfectly). She closes tightly. Second advantage: It is comfortable, there is no pressure complaints. Even with long-term use, it is still comfortable to wear. Third: In my opinion, it is quite easy to combine also with glasses and goggles.
Disadvantage: It is of protection class produces only mediocre and it shows. Who wants to be sure and to the fullest possible dust and chem. Gases protective emphasis, which should select a higher protection class. For Nitro finishes eg I have the "Dräger X-plore 3300 refinisher set Spray half mask + A2P3 filter" used that acts much better, but (especially with glasses) is unwieldy and annoying during extended wear.
Second drawback: no filter change possible. But at the price that is justifiable. Then you have to stop off and take on a new mask.
