I am looking for a used mbu-20 oxygen mask. Does anybody have the dimensions for choosing the offered sizes. I have seen a chart once...but for the life of me, can't find it since. Gentex offers small wide...medium narrow etc, but no sizing chart. I don't want to eBay purchase one that is the wrong size.
if anybody has one for sale....please feel free to let me know as well.
I am building a fresh air system for civilian rotary wing...so the mic, cords, and pressure system tubes are not required.
Thanks!