No, that is not true: "Some disposable N95 masks come with an optional exhalation valve." https://www.honeywell.com/en-us/newsroom/news/2020/03/n95-masks-expla

No, that is not true: "Some disposable N95 masks come with an optional exhalation valve." https://www.honeywell.com/en-us/newsroom/news/2020/03/n95-masks-explained https://www.honeywell.com/en-us/newsroom/news/2020/03/n95-ma...