Choosing the Right Size 3M Respirator Mask
3M Full Face Respirator Sizing. Designed to protect sensitive membranes in the eyes, nose, throat and mouth, 3M 6800 series full face respirators come in 3 sizes, Small, Medium and Large. Each of the 3 masks are all the same size except for the rubber seal which is mounted to the product. The rubber face seal dictates the size of each of the masks.