So most of them are vented BUT there are some that are not. GVS sells one with source control: https://www.gvs.com/en/catalog/elipse-p100-with-source-control-n

So most of them are vented BUT there are some that are not. GVS sells one with source control: https://www.gvs.com/en/catalog/elipse-p100-with-source-control-niosh-respirator https://www.gvs.com/en/catalog/elipse-p100-with-source-contr... Most of 3M's stuff does not have source control but I just discovered tonight that there is an add-on exhaust filter to the 6000 series of masks: https://www.3m.com/3M/en_US/p/d/v101254496/ https://www.3m.com/3M/en_US/p/d/v101254496/ I wore a 6000 series mask for most of 2020 and 2021 but upgraded to a 7000 series when the elastic wore out on the 6000. Both the 6000s and 7000s are super comfortable. You just might get some strange looks, particularly if you are sporting the bright pink P100 filters. I have not yet been able to find a source control equivalent for the 7000 series. One great superpower of the 3M masks (6000/7000 etc.) is that wearing one of these while going to a port-a-potty means that you do not smell anything at all =)