The Supreme, Classic, Mini, Elite, Piccolo S and Piccolo are manufactured to EN 14975 (DN 4570).

 

(Please note that where 250 mm wide treads are required in the Supreme and Elite models, these do not comply with EN 14975 (DN 4570))

 

F30 and F90 models are tested to DIN 4102 Part 2.

 

The Elite ladder and the ladder within the Supreme model are manufactured from die-cast aluminium alloy. The Piccolo S, Piccolo and ladder within the Mini are manufactured from extruded aluminium alloy.

Load bearing:

Supreme - 200 kgs per tread – overall unit 500kg/m2 Classic - 150 kgs per tread – overall unit 350kg/m2 Mini - 150 kgs per tread – overall unit 350kg/m2 Elite - 200 kgs per tread – overall unit 500kg/m2 Piccolo S - 150 kgs - per tread – overall unit 350kg/m2 Piccolo - 150 kgs - per tread – overall unit 350kg/m2

Construction of hatchbox and trapdoor:

Supreme - hatchbox and trapdoor both 18 mm thick laminated wood.

Supreme with insulation - 63mm thickness coated white to the underside.

Mini (standard) - hatchbox and trapdoor both 18 mm thick laminated wood.

Classic - hatchbox and trapdoor both 18 mm thick laminated wood. Supreme F30 with a wooden hatchbox and trapdoor. The hatchbox is made from 19 mm chipboard and coated with Pyroex. The trapdoor is made from 28 mm chipboard and coated with Pyroex

Hatchbox
Minimum depths:

Wooden hatchbox without insulation - 170 mm
Wooden hatchbox with insulation - 240 mm
Steel hatchbox (F30) - 200 mm
Steel hatchbox (F90) – 240 mm
Supreme F30 with a wooden hatchbox and trapdoor - minimum hatchbox depth is 210 mm

 

Minimum lengths for electrical operation:

Wooden hatchbox and trapdoor (without insulation) 1165 mm

Wooden hatchbox and trapdoor (with insulation) 1200 mm
Steel hatchbox and trapdoor F30 1115 mm
Steel hatchbox and trapdoor F90 1170 mm

Top operating handle

The ceiling thickness must not exceed 450 mm and there must be clearance of at least 700 mm behind the opening

F30 and F90 steel hatchbox construction:

1.5 mm thick steel hatchbox with a steel trapdoor. The trapdoor is made from 2 layers of 1.5 mm thick sheet steel infilled with 38 mm of mineral wool to give a 30 minute fire resistance or 75 mm of mineral wool to give a 90 minute fire resistance. There is a 29 mm wide lip to the bottom of the lining around the external edge, which is designed to butt up against the ceiling to help prevent flame and smoke ingress. Similarly, there is also a lip to the bottom of the steel trapdoor, which extends to within 15 mm of the lip on the lining.

Insulation

 

a) Weatherproof roof hatch/flat roof exit – standard model:
Roof hatch = U-value 1,1 W/ m2 K
Trapdoor = U- value 0,8 W/ m2 K

Maximum (optional):
Roof hatch = 0,31 W/ m2 K
Trapdoor = 0,8 W/ m2 K

Weatherproof roof hatch/flat roof exit with wooden hatchbox and trapdoor F30
Standard - U-value 1.1 W/ m2 K

Weatherproof roof hatch/flat roof exit with steel hatchbox and trapdoor F30
Standard - U-value 1.1 W/ m2 K

Weatherproof roof hatch/flat roof exit with wooden hatchbox and trapdoor F90
Standard - U-value 0.43 W/ m2 K

 

b) Supreme – standard model = U-value 2,4 W/m2 K.

Optional insulation = U-value 0,55 W/m2 K

 

c) Mini with insulated trapdoor = U-value 0,8 W/ m2 K

 

d) Supreme – standard wooden hatchbox F30 = U-value 2,0 W/ m2 K. Optional insulation = U-value 0,8 W/ m2 K

 

e) Supreme – standard steel hatchbox F30 = U-value 0,86 W/ m2 K

 

f) Supreme – standard steel hatchbox F30 = U-value 0,43 W/ m2 K

 

g) Classic – standard model = U-value 0,8 W/ m2 K

 

h) Classic – standard model steel hatchbox F30 = U-value 0,86 W/ m2 K

 

i) Classic – standard model steel hatchbox F90 = U-value 0,43 W/ m2 K