The doors are assisted with specially designed torsion springs, of various gauges and lengths, to suit door size.
Guide channels are galvanised roll form U sections 2.5mm thick – 50mm; 63mm; 75mm deep according to door size. Galvanised fixing angles are spotwelded according to installation application.
The hand chain is galvanised mild steel calibrated chain which drives a glass reinforced nylon planetary gear set providing a reduction of 3.5:1, and runs through a pressed galvanised chain guide fitted with nylon inserts.
Electrically operated doors are supplied with half HP motor. Pre-wired with low voltage cables to a 3 push button control at the low level and a 16amp 5-pin plug at the high level. Gear driven travel limits are contained within the starter enclosure. Emergency opening and closing is via floor level controlled haul chain.
Each door is normally fitted with a waist high shoot bolt, which is zinc plated and specifically designed to fit the door profile. They are conveniently at waist height and are padlockable. The hand chain is also padlockable in 4mm thick plated steel chain keep. No lock is normally supplied on electrically operated doors.
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