C55 Range

Introduction  A strong, versatile commercial standard cold rolled galvanised formed-steel door system.  The use of cold rolled box sections allows more versatility of door screen design due to its greater strength over mild steel equivalents, whilst maintaining the relatively slim profiles for which steel is renowned.  Available in high performance double glazed format (28mm units), this section is ideal for medium to high traffic situations such as schools, offices, sports and leisure complexes etc.  A large range of quality ironmongery can be fitted and the system includes matching sections for top / side hung opening windows for use as fan or side lights.  This range is suitable for fire rated applications - utilizing pre-formed steel clip-on beads for retaining glass (contact our technical department if fire rated doors are required).  The design of this section makes it ideal for use in high traffic areas whilst also offering a 28mm glazing capacity to meet the thermal requirements of the latest Building Regulations.  The C55 door is an ideal replacement for ailing entrance doors and is an attractive product suitable for modern new build developments.
 
Specification  Doors manufactured from the C55 range of purpose-made tubular cold rolled steel sections which are based on the Italian Secco system and generally manufactured in accordance with procedures laid down in BS.6510:1984. All frames will have welded corners, be flat and square and within normal manufacturing dimensional tolerances of +/- 2mm.

Galvanizing  All windows and doors, including any steel attachments, coupling members or ancillary items, will be hot-dip galvanised after manufacture to BS.729:1971 (1986) with a minimum coating weight of 460gsm. 
 
Polyester Powder Coating Galvanised windows and doors will be polyester powder coated using Syntha-Pulvin powder. The powder will be in accordance with BS.6497:1984, to an average thickness of at least 60 microns on all significant surfaces.  Colour of polyester powder coated elements will be any single standard BS/RAL reference colour (true mettalics not included). 
 
Weatherstripping  Doors double weatherstripped with E.P.D.M. gasket seals, secured into pre-formed grooves.
 
Bead Glazing  Glazing via external or internal profiled steel beads located onto concealed bead carrier studs.  Glazed with gaskets on bead side and tape/silicone cap on glazing leg side (low modulus silicone sealant to a colour sympathetic to frame colour).  Alternatively, silicone colour matched to frames for additional charge.  All beads finished as window frames.
 
Glass  All glass will be 28mm thick hermetically sealed double glazing units.  Units generally comprise inner and outer pane of 6+mm.  Combinations of toughened / laminated / obscured / special / hard or soft coat low "E" inside / outside panes can be utilised.
 
Heat Loss  C55 doors in most circumstances will have a typical "u" value of around 2.1 W/m2K with soft low "E" coated argon gas filled double glazing units.   The C55 range therefore meets (*)  the requirements of Part L of the Building Regulations 1st April 2002 in respect of the Conservation of Fuel and Power.  *Note: the C55 range is currently undergoing tests for certification (for new build contracts) but stated results are anticipated by comparison with similar sections using glazing as already tested.
 
Please note that this is only a summary of the range and that all technical and specification details, photographs etc. can be produced upon request.

Frame Type (*)	(Width) x (Height)	Air / Water / Wind (Pa)	Where enhanced safety, security or weather performance is needed - tighter limitations are required.  Our office would be pleased to advise on doors outside of stated limits.  Test pressure class and exposure category are of typical types and sizes when tested to BS 5368 and classified as BS 6375:Part1.
Single "Standard" Door Double "Standard" Door Single "Entrance" Door Double "Entrance" Door	(400-3000) x (1500-2200) (800-1000) x (1500-2200) (400-1100) x (1500-2600) (800-2200) x (1500-2600)	Graph C / 300 / 2000 Graph C / 300 / 2000 Graph C / 300 / 2000 Graph C / 300 / 2000