How to Find Your Size
To determine which size of the OSR-M1 is best for you (S, M, L), measure the straight distance between the bridge of your nose and your chin.
Refer to these guidelines for the min–max. range of facial measurements recommended for each size. You may fall in between sizes. If in doubt, a smaller size may help you achieve the tight facial seal that is critical to effective filtration.
* Measure straight down from bridge of nose to bottom of chin.
| OSR-M1 FACEPIECE SIZE |
WEARER’S BRIDGE OF NOSE TO CHIN * | |||
| Inches | Milimeters | |||
| Min | Max | Min | Max | |
| SMALL | 3 13/16” | 4 1/8” | 97mm | 105mm |
| MEDIUM | 4 1/8” | 4 1/2” | 105mm | 115mm |
| LARGE | 4 1/2” | 5 1/16” | 115mm | 128mm |