## 9.1.16.3 Folding Shutter Doors 

Folding shutter doors shall be bi-parting, and shutter constructed of galvanised mild steel having two coats of paint and zinc chromate primary coated. The leading two pairs of shutter leaves shall bunch independently of each set to provide a personnel passage. Leaves shall generally be about 305 mm wide, shall bunch against columns at jambs and shall be reinforced with a lattice frame of approved design. The top rolling track shall be supported by brackets, which are bolted to the underside of the supporting reinforced concrete beam. A channel guide set into the floor slab shall finish flush with the internal floor finish and shall be of heavy duty rolled steel sections set apart with bolted or welded dis- tance plates or of other suitable design capable of trafficking by heavy trucks. Dirt boxes with access covers shall be provided at each hanging (bunching) jamb. Channels shall carry surface water drainage into dirt boxes, which are to be provided with outlets discharging into sleeves to the exterior of the building. Where required a 14 gauge end panel shall be fitted to close off each jamb and fit to one slamming stile a hook lock and a mortise box to the other with lock of the five levers or pin tumbler pattern to the Engineer’s approval. The key shall be operable from the outside and the inside of the building. Rubber draught/dust excluding seals shall be provided at the top and bottom edges. 

Each slamming stile shall be fitted with a pair of heavy duty ”D” pull handles securely bolted through the door and located above or below the lock without obstructing it. 

The Contractor shall provide for approval details of folding doors and full information location and fixing details, allowing for all boxing out and drillings which will be required. The Contractor shall ensure that reinforcement details, building details and the like on all affected structural and general arrangement drawings are compatible with the door and these shall be submitted to the Engineer for approval at the same time as the door details above are provided. 

## 9.1.16.4 Internal Doors and Frames 

Internal doors and frames shall be hardwood timber. All internal doors shall be painted to a colour as agreed with the Engineer. 

Internal doors shall be designed such that they swing to the closed position unless deliberately held open. 

## 9.1.16.5 External Doors and Frames 

External doors and frames shall be thermal blistered and finished externally in anodised aluminium with a bronze tone that matches the windows. 

External doors shall be designed such that they swing to the closed position unless deliberately held open. The doors and frames shall be fitted with efficient draught excluders. 

Glazing to external doors shall be toughened glass. Samples of toughened glass shall be submitted to the Engineer for his approval. The colour of all external glass shall be to the approval of the Engineer. 

Large gates may be designed as folder doors. 

## 9.1.16.6 External Windows 

All windows shall be from one manufacturer only and be manufactured from extruded aluminium. Windows shall be of the thermal blistered double insulated type and shall be glazed in a coloured glass to the approval of the Engineer. Windows of toilets and showers shall be frosted. 

