XRS level X4 · Breathing endurance
1 TO 2 HOURS
Designed for one to two hours.
What it means for you
- Duration
One to two hours, then a break is welcome.
- Effort you feel
The resistance is distinct at every breath in.
- Activity
Calm activities; not well suited to effort.
What it does not tell you
The XRS level measures breathing comfort, not protection. To know what this mask filters, look at its protection class (for example FFP2, N95, KN95) and the manufacturer's instructions. An XRS level never replaces a safety instruction.
How it is measured
A laboratory measures the effort needed to draw air through the new mask. This level corresponds to a specific resistance between 100 and 140 Pa/(L·s⁻¹).
Verify this declaration
Every declared level is entered in a public register. If the number is not there, write to us.