| Fabric type | Air permeability flow (Pa) (L/m2/s) | Time (s) |
| Polypropylene non-woven Woven-single layer Woven-two layers Woven-three layers Knitted-single layer Knitted-two layers Knitted-three layers | 100 - 480 200 - 2800 200 - 1800 100 - 1800 500 - 3600 300 - 2500 200 - 1900 | 10 - 15 s 10 - 15 s 10 - 15 s 10 - 15 s 10 - 15 s 10 - 15 s 10 - 15 s |