I ordered two masks.
Upon receiving the first literally broke trying to put it the first time (the plastic that holds the cartridge). It is not repairable!
The second did not hold more than a half day.
Filtration, given the gap between the plastic poor.
Moreover, he feels the new plastic so strong that poisons does it a disservice.
Cheap product but one that should not be sold as a security product.
22 to live trash!