The easily adjustable elastic head harness of the mask is designed as a V-shaped loop and has a large, dished crown plate, which contributes towards a comfortable and secure fit.

The Compressed air attachment SR 307 can be connected. A pre-filter holder and test disc for simple checking of the performance are supplied. Best stored in box SR 230 or storage case SR 339.
Inhalation resistance at 30 l/min ≈ 3 Pa ≤ 50 Pa
Exhalation resistance at 160 l/min ≈ 70 Pa ≤ 300 Pa
Service temperature -10 – +55 °C, < 90 % RH
Storage temperature -20 – +40 °C, < 90 % RH
Weight ≈ 179 g
Assigned Protection Factor¹ 20 (P3), 10 (GasX), 10 (GasX P3)
Nominal Protection Factor2 48 (P3), 50 (GasX), 48 (GasX P3)
Compliance:
Tested in accordance with EN 140:1998 
Nominal protection factor 50
Specified in BS 4275, and applies generally to all half masks with particle filters P3, regardless of the test results.
According to EN 529:2005
 
Note: Filters & cartridges sold seperately