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Supreme stairway with steel hatchbox and trapdoor available with two trapdoor options - fire resistant to 30 minutes or 90 minutes

Supreme stairway with steel hatchbox and trapdoor available with two trapdoor options - fire resistant to 30 minutes or 90 minutes
23/11/2011

Supreme stairway with steel hatchbox and trapdoor available with two trapdoor options - fire resistant to 30 minutes or 90 minutes

A concertina style strong, ready to fit stairway manufactured from high strength die-cast aluminium alloy components. The stairway is attached to a 1.5 mm steel hatchbox, and a trapdoor made from two layers of 1.5 mm steel infilled with 38 mm of mineral wool for the 30 minute and 75 mm for the 90 minute.

There is a 29mm 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, a lip to the bottom of the steel trapdoor extends to within 15 mm of the lip on the lining.

The floor to underside of ceiling height is up to 4300 mm and there’s a minimum opening length requirement of 780 mm, which varies according to the floor to ceiling height, and a minimum width requirement of 595 mm. The load bearing per tread is 200 kgs. CAD drawings for the steel hatchbox F30 and F90 are available on the Premier web site (www.premierloftladders.co.uk).

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