General
The doors shall be suspended from an extruded aluminium overhead track, without floor tracks or guides. The closing stiles shall be fitted with heavy duty custom designed latch and handles.

Trolleys
Doors shall be fitted with nylon tyred steel ball-bearing wheels at each pantagraph cell. 2 wheels per trolley. Lead stile to be fitted with 2 trolleys

Construction
The pantagraph frame of the doors to be manufactured from extruded aluminium. These extrusions are linked together at the extremities by 5mm diameter galvanised steel rods, a minimum of 3 pantagraph sections per cell. The frame is covered by layers of flexible material, the outer layer as selected from the manufacturer's standard range.

Acoustics
It is Spacial Concepts aim to control the sound transmission between rooms to a level where it is no longer distracting even though some sound may be audible.
25 - 27 STC: Conversation audible but may not distract
30 - 36 STC: Mutes normal conversation

MODEL SERIESSOUND RATINGMAX. HEIGHTAPRROX WT PER M2APPROX STACK DEPTHAPPROX STACK WIDTH
 dbstc    
300 N/a N/a 4.0 7.0kg 165mm per meter of opening + 120mm 300mm
321 29 21 4.0  8.5kg 165mm per meter of opening + 120mm 300mm
325 32.2 25 4.0 10.5kg 165mm per meter of opening + 120mm 300mm
327 36 27 4.0 12.0kg 165mm per meter of opening + 120mm 300mm
330 47.1 30 4.0 14.0kg 180mm per meter of opening + 180mm 350mm
336 50.1 36 4.0 18.0kg 180mm per meter of opening + 180mm 350mm

Acoustic Gurantee
Spacial Concepts shall gurantee in writing that the accordian doors supplied are of like construction to the laboratory tested doors. Test certificate shall be produced on request.