| STANDARD SPECIFICATION Door
leaves
The door leaves are manufactured from 3mm thick mild
steel plate with special purpose built hollow section stiles
and
rails. The modular design allows them to be delivered in
sections for joining on site. Tracks
The doors are suspended from heavy-duty box-type top tracks
by four wheel pulley assemblies and the track fixed to the
structure by means of fabricated steel track brackets. The
design requires no bottom track allowing an unbroken floor
surface. Frame
A peripheral interlocking steel frame is supplied to maintain
a fire seal. OPERATION Manual operation
Most doors are normally parked in the fully open position
closing only in the event of fire. In these circumstances,
the doors would be supplied manually operated with self-closing
activated by either a fusible link or the interruption of
a permanent fire signal to a 24 volt DC magnet. In the latter
case, we recommend a speed governor to control the closure. Electrical Operation
Suitable for larger openings or when frequent usage is envisaged.
Operation is via a 240-volt single-phase geared motor with
an inherent 24-volt DC magnet which holds the door open.
An open / close / stop push station allows everyday electrical
operation but in the event of a fire, interruption of the
fire signal to the magnet releases the door which closes
manually with a controlled speed.
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