Stairs with smoke-proof filter

The Ministerial Decree of 30 November 1983 “Terms, definitions, general definitions and graphic symbols of fire prevention” (downloadable here in pdf) reports, in the section dedicated to crowding and exodus, the types of stairs in the design of the exit route system.

Fire prevention terms, general definitions and graphic symbols
The legislation concerning fire prevention uses specific terminology which therefore has a different meaning from that commonly used.
It is advisable, especially for those who deal with this matter for the first time, to read the Ministerial Decree of 30 November 1983 – Terms, general definitions and graphic symbols of fire prevention – in order to understand the meanings of the terms used as, almost all the specific legislation , refers to this decree for these aspects.
It is advisable to pay some attention to these aspects also in the preparation of the reports as an incorrect use of the terms could achieve a different result from that expected.

Smoke-proof staircase.
Staircase in the compartment constituting the fire-fighting compartment having access for each floor – by means of fire resistance doors at least REI predetermined and equipped with self-closing device – from open space or from open hallway for at least one side on open space equipped with open parapet.

Internal smoke-proof staircase.
Staircase in the compartment constituting the fire-fighting compartment having access, for each floor, from a smoke-proof filter.

Protected staircase.
Staircase in the compartment constituting the fire-fighting compartment with direct access from each floor, with doors of predetermined REI fire resistance and equipped with self-closing device.