| STANDARD SPECIFICATION Curtain/Bottom
Rail
Specially reinforced and coated grey fibre-glass material
approximately 0.7mm thick and weighing 900 gms per m2 which
withstands temperatures of more than 200 degrees C. The curtain
is looped at both ends to fit around a mobile rod within
the side guide to avoid deflection. The material is attached
to the roller at the top and to a steel bottom rail which
is formed to create a slim-line soffit with no visible fixings
when in the raised position.
Guides
The side guides are roll-formed
from galvanised steel and prepared for fixing to the opening
structure by non-visible
bolts. The guide incorporates a unique retaining rod to ensure
the curtain is always engaged in the guides and has been
reduced in size to 105mm x 74mm.
Casing
The casing is manufactured from
galvanised steel and is available in two different sizes
dependant upon opening width.
It may be soffit or face fixed to the structure. Roller
The roller is manufactured from
mild steel tube of sufficient diameter and wall thickness
to resist deflection and is mounted
in bearings on each end plate. Seals
The perimeter of the assembly features
inflatable silicone seals fitted to the casing and guides
which inflate automatically via a mini-compressor once the
curtain has
reached the fully
closed position. The pressure is maintained even in the event
of power failure by means of a one way valve.
OPERATION The curtains are electrically operated as standard using
a range of 240-volt single phase motors with a control panel
incorporating batteries. The design incorporates a gravity failsafe system which
on receipt of a 24 volt DC fire signal, releases the motor
brake and allows gravity closure with a controlled descent.
Each shutter is individually
operated from a low-level surface mounted key-switch.
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