On 3 Dec 2005 14:12:28 -0800, a particular chimpanzee named "dg"
randomly hit the keyboard and produced:

Intumescent seals on self closing doors or an intumescent baffle in the
chute

A bit more information needed. What kind of building (hotel, flats,
within a single house)? How many storeys?
--
Hugo Nebula
"If no-one on the internet wants a piece of this,
just how far from the pack have you strayed?"