Technical Features
Framework
- Steel frame constructed of 50 x 25 x 2.0mm ERW complete with 100 x 100 x 5mm floor plate and 50 x 10mm writing shelf support plate. 1 no pair of swivel brackets provided per seat place, complete with nylon bushes for friction free tipping action designed to give a minimum of 100,000 cycles of operation.
- All metal work to have all weld spatter removed prior to being thoroughly de-greased and de-scaled before being powder coated. Colours available from the British Standard or RAL colour range.
Upholstery and Shelves
- Seat base measures 400 mm deep. Interior 18mm thick plywood base with all corners rounded and all sharp edges removed.
- Seat foam to be 75mm thick overall, consisting of 50mm thick, 6lb recon foam core topped with 25mm thick, 25/30kg/m3 CMHR foam. Top foam to be complete with skirt which is to be long enough to be wrapped over all edges of seat plywood base to give protection to the seat base covering fabric. Underside of the seat to be finished with 3mm thick plywood base covered with selected fabric.
- Back rests vary in depth owing to the height of the riser. Back rest has interior 15mm thick plywood base with all corners rounded and all sharp edges removed. Back foam to be 40mm thick, 25kg/m3 CMHR foam. Back foam to be complete with skirt which is to be long enough to be wrapped over all edge of the back plywood base to give protection to the back unit covering fabric. Back unit complete with Tee nuts for assembly to the supporting metalwork. Back unit covered in selected fabric.
- Where the tiers of a lecture theatre are high the back rest can be extended so as to form a modesty panel for the seat row behind.
- Upholstery complies with BS 5852 Source Ignition 0,1 & 5 (Crib 5) flame retardancy standard.
- Chair and seat tilt mechanism has been tested to BS EN 12727:2000 Level 4 for strength & durability.
- Writing shelves to have various widths dependant on tier depth and riser height but has a standard width of 290mm wide and laminated on one face with Formica Fundamentals laminate. All edges to be ABS type to match the writing shelf laminate.
- Portable writing shelf units to be provided for use by wheelchair bound students.