I have a plastic pipe passing through a rectangular aperture?

Rectangular apertures can be fire stoppednusing various methods, including mineral fibre slabs and fire-resistantnmortars. Collars, in such applications are often installed within the element,nwhereby the collar is essentially cast into the penetration. Whilst there isntest evidence to support this detail, we would recommend that the collars arenalways fitted are always fitted to the extremities of the construction. Fornfurther advice on these types of applications, please do not hesitate to contactnthe technical department for guidance.