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Thickness (mm)
Visibility (m)
Wood-fibre insulating board
12.7
17.00
Phenol formaldehyde faced hardboard
4.0
5.20
13.0
4.80
Softwood panels
6.4
4.30
Hardboard
3.7
4.10
Melamine-faced hardboard
3.2
4.00
PVC-faced hardboard
5.7
3.00
Rigid PVC panels
1.6
2.80
12.7
2.70
3.3
1.50
Building board
Polyurethane foam sandwich
Chipboard Glass-fibre reinforced polyester
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Natural systems of smoke control
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• • – •
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– –
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•
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2
2
D