X =
3 - Water transmission
resistance: > 20.000 Pa
(water column > 2.000 mm)
Y =
3 - Water vapour
transmission resistance:
Ret 4,2 m
2Pa/W
X =
2: ≥ 8.000 Pa,
3: ≥ 13.000 Pa,
4: ≥ 20.000 Pa
Y =
1: R
et > 40,
2: R
et ≤ 40,
3: R
et ≤ 25,
4: R
et ≤ 15 m
2Pa/W