D.5.3.4 insulated

D.5.3.4 insulated to "A-60" standard from the machinery spaces, galleys, vehicle spaces, ro-ro cargo
spaces or special category spaces to a point at least 5 m beyond each fire damper; or
D.5.3.5 constructed of steel suitable supported and stiffened (see D.5.3.1) and insulated to "A-60"
standard throughout the accommodation spaces, service spaces or control stations.
D.5.4 Ducts provided for the ventilation to accommodation spaces, service spaces or control stations
shall not pass through machinery spaces of category A, galleys, vehicle spaces, ro-ro cargo spaces or
special category spaces unless either:
D.5.4.1 the ducts where they pass through a machinery space of category A, galley, vehicle space, roro
cargo space or special category space are constructed of steel, suitable supported and stiffened (see
D.5.3.1),
D.5.4.2 automatic fire dampers are fitted close to the boundaries penetrated and
D.5.4.3 the integrity of the machinery space, galley, vehicle space, ro-ro cargo space or special category
space boundaries is maintained at the penetrations or