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Minimum thickness of a steel-reinforced concrete slab with air ducts containing combustible components according to DIN 4120
Design features
Min. depth for air duct installation* [mm]
Min. slab [mm]
Min. recommended thickness without taking into
account the crossing of wires through corrugated
pipes for electrical wiring [mm]
DN - Ø 63, 75 or 90 mm air duct
The data in the table also applies to installation in a monolithic slab.
*The data is only valid for the installation of a seamless screed on an insulated base (floating floor) with a minimum thickness of
25 mm.
6
Recommendations on calculation of slab thickness
≥ 3xDN
One family house
d1
50
d = 180
d = 200
Fire resistance class
Low-rise buildings
F 0
F 30-A
d2
d1
50
50
d = 220
d = 240
DN
High-rise buildings
from 5 storeys
F 90-A
d2
d1
d2
50
50
50
d = 240
d = 260
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