N95, N99, N100: What's the Difference Between Each Mask?
Dec 20, 2019·N95, N99, N100: What’s the Difference Between Each Mask? Dec 20, 2019. If you’ve ever looked into masks and respirators, you’ve probably encountered some terminology you don’t understand. It’s okay; every industry has their jargon. With masks, you’re most commonly going to see classifications such as N95, N99, and N100.