On most apartment landings there is a steel panel set into the wall beside the lift. It carries a floor number, or years of repainting have made it the same colour as the wall. Behind it the heating risers, water pipes, waste stack, power and data cables run vertically up the building. That panel is the least inspected and hardest working door in the block: the shaft access door.
What it does
A shaft is the vertical void carrying a building's service risers. The access door does three jobs. It provides access for repairs, meter reading and maintenance. It closes the void, which otherwise sends noise, smell and dust into the corridor. And, most often overlooked, it contributes to fire compartmentation: a shaft behaves like a chimney, and a fire on one floor can travel up it quickly. The door is one of the elements limiting that vertical spread.
Construction and hardware
The body is formed from steel sheet, the frame is built into the wall opening, and the leaf hangs on hinges or concealed fixings. The surface is electrostatic powder coat, since no cladding layer is appropriate here. Common hardware options:
- Triangular key lock: authorised access only; residents cannot open it.
- Cylinder lock: opened with the building management's common key.
- Padlock lug: simple and economical, common on plant room openings.
- Lever handle: for frequently accessed meter niches.
- Louvre: where the shaft needs ventilation, though never on a rated door.
Does it need a fire rating
That answer comes from the architectural drawings. Because the shaft crosses floor slabs vertically, in most buildings it counts as a separate fire compartment and the access door is required to meet a resistance class. Where a rating applies, the door must be produced as a certified system with the core, intumescent seal line, lock and frame fixing tested together. Painting an ordinary sheet panel and fitting it to a shaft opening is not accepted at inspection. Where no rating applies, a standard powder-coated steel panel is sufficient.
Why sizes are never standard
An apartment door can hold a standard size; a shaft door cannot. Width follows the number of risers, depth follows the wall section, and height follows access needs. Even different floors of the same building vary: a basement needs a wide panel for manifolds and valves while an upper floor needs only a meter niche. Shaft doors are therefore made to measure almost without exception.
Measuring
Take width and height at two points each and use the smaller figures, all in centimetres. Record the wall thickness and whether the door is flush-set or overlapping. Note the height of the opening above finished floor, since the door must sit at a reachable level. Check whether the services behind the opening obstruct leaf swing. Confirm where the bottom edge meets the floor finish and skirting. Above roughly 100 cm width, a single leaf blocks the corridor when open, so double leaves work better.
Installation and project planning
The frame is anchored into the opening and the void around it filled. On rated doors that filling material is not a free choice; it must match the tested detail. Flush installation leaves the panel level with the wall and almost invisible once painted, while overlapping installation keeps it proud and easier to access. Label each door with its floor number and service type at handover.
Shaft doors usually sit at the end of a door schedule as the highest quantity and lowest unit price, yet the quantity drives the delivery plan: two per floor on a ten-storey block is twenty doors with twenty different sizes. Measuring once and producing in one batch is the efficient route. Ordered together with fire doors and building entrance doors for the same project, colour and hardware standards are set once and everything loads in Istanbul in a single shipment.
