Allproof Drop in fire collars provide a simple and effective passive fire rating option for thin concrete floors or trapezoidal steel tray concrete floors. These floors feature profile changes on the underside of the slab and make it difficult to fire rate with a conventional fire collar fixed to the underside of a floor slab.

Drop in fire collars have been designed, made and tested in New Zealand for NZ projects. They can be retrofit around pipes and easily drop into position being fixed from above. The unique extendable tab allows for the drop in fire collar to be adjusted for varying depths of composite floor slabs. DIFCs have been accessed to provide a passive fire protection system for composite floor penetrations on a range of plumbing services. The assessment found that Allproof DIFCs FRL is equal to the FRL of composite floor with tray profiles of 60mm, 80mm and 210mm.

Drop in fire collars have also been tested to provide passive fire protection on floor waste systems, flat slabs and plasterboard ceilings.

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