STANDARD COLUMN Consisting of a base, a closed module, a semi-closed module, six open modules and a lamp holder in GG-20 pearlitic cast iron, with a height of 9550 mm. 12 anchorage bolts in M-24 zinc-coated steel, 1000 mm in length. VENTILATION GRID Upon request, one of the modules can be fitted with a ventilation grid made out of steel plate, protected with a rust-proof coating (dichromated). TRAP DOOR COVER Made out of hot-galvanised steel plate. HAT The lamp holder is crowned with a polyester hat reinforced with fibre glass. DIFFUSOR: Diffusor in 4 mm thick methacrylate, reinforced at the two ends, 600 mm in diameter and 1000 mm in length. NUTS AND BOLTS In A4 stainless steel.