Valved N95 that I like to wear with a surgical mask on top
https://us.vwr.com/stibo/low_res/std.lang.all/67/42/9356742.jpg
https://www.dropbox.com/s/nxcex66wgw7goo7/VWR-mask-with-valve.product-89201-510.9356742.jpg?dl=0
Shown at
https://us.vwr.com/store/product/4788523/vwr-n95-disposable-respirators but not currently available
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