Breathers provide continuous pressure equalisation between the inside of the enclosure and the atmosphere around the enclosure. This prevents moisture from entering the enclosure via the seals and condensing inside the enclosure.
Here you can find the best breathing you need.
According to ISO 80079-37:2016 there is only one marking possible: Ex h
Paper is combustible and easily ignitable when finely divided; all that is
Unboxing you may find what you have been looking for… What shall
Is there any difference if it comes from an Ex repair facility
arpadveress 
