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Protection of suspended ceiling

Question asked by hubma on Jan 17, 2016
Latest reply on Feb 11, 2016 by ahering


I wonder how it is with the protection of the space inside false ceilings made of modular panels of 60 x 60 cm.

What determines whether it is needed to protect or not?

It and there is some information but point A. says that value is not definied

Any idea?

Thank you for help