Features and added value: One inspection flap for the ceiling without fire protection cover, universally applicable for planking thicknesses 18, 20 and 25 mm, low putty effort, easy installation, low opening stroke, can also be retrofitted. Application: Inspection flap for installation in F30 fire-resistant suspended ceilings for planking thicknesses from 18 to 25 mm. Installation with additional substructure / replacement.