Two of the most common SignShine strip formats are 400 × 75 mm and 600 × 100 mm. Both are long, low-profile plates, but the right choice depends on viewing distance, wording length, mounting location and the project specification.
When 400 × 75 mm works well
The 400 × 75 mm format is compact and works particularly well beside doors, over service cupboards and in internal corridors where the reader is relatively close. It is also useful when the sign wording is short — for example PLANT ROOM, COMMS ROOM, BIN ROOM or ELECTRICAL SWITCHBOARD.
Because it is only 75 mm high, it reads as a discreet architectural strip rather than a large safety panel. That makes it a strong choice for brushed silver or gold identification signage in apartment and commercial buildings.
When 600 × 100 mm is the better choice
The larger 600 × 100 mm format gives wording more space and increases visibility from further away. It is useful for longer fire-door or service-room messages, wider doors, plant areas and locations where the sign needs to be picked up quickly on approach.
A larger sign is not automatically more compliant. Size should follow the project documentation, applicable standard or certifier requirement where one applies.
Think about wording before size
Long wording forced into a small strip can become cramped. If the text has two clauses, a long room description or a required minimum letter height, move up in size rather than squeezing the typography. Clean spacing usually improves legibility more than simply making the plate wider.
Keep a building schedule consistent
On multi-sign projects, choose a default size for short room names and another for long notices. For example, a project might use 400 × 75 mm for room identification and 600 × 100 mm for longer statutory wording. This creates visual consistency without forcing every sign into one format.
Confirm before manufacture
If a drawing, specification or certifier note nominates a size, follow that requirement. If it does not, send SignShine the wording, installation location and preferred finish and we can help you choose a practical format.
Consider the mounting surface
A 400 × 75 mm plate usually fits neatly on a standard door or narrow wall zone. A 600 × 100 mm plate needs more clear surface area and can look oversized on a small cupboard door, but it is easier to read across a larger plant room or basement. Measure the available surface before ordering a large quantity, especially where handles, closers, vents or existing labels reduce the usable area.
Letter height matters more than the plate alone
Two signs with the same outside dimensions can have very different readability depending on the wording length and layout. Long wording needs more horizontal space or a larger plate to keep the lettering clear. If a project document specifies a minimum letter height, choose the plate size that allows that requirement to be met without cramped typography.
A practical schedule approach
For many projects, it is useful to nominate one default strip size for short room names and one larger strip size for longer notices. Put the chosen size in the master schedule and flag only the exceptions. That approach speeds up ordering, artwork checking and installation because the site team is not making a new sizing decision for every door.
When to ask before ordering
If you have an unusual phrase, a narrow mounting area or an architect-specific finish, send the wording and a photo or drawing before ordering the whole batch. A quick check at schedule stage is much cheaper than replacing dozens of plates after installation.
Compare the sign from the reader’s position
A size that looks generous on a computer screen can feel much smaller once installed over a doorway or across a wide corridor. Before ordering, consider where a person will first see the sign, how far away they are likely to be, whether the sign sits above eye level and whether surrounding finishes compete for attention. Longer wording usually benefits from a wider format because the text can remain comfortably spaced instead of being compressed.
For a multi-level project, consistency also matters. Using one preferred strip size for similar room-identification signs can create a cleaner result and make future replacement orders easier. Exceptions can then be documented for longer messages or locations with different viewing conditions.
Use the size as part of the schedule specification
Rather than writing only “PLANT ROOM sign”, write the schedule line as something like “PLANT ROOM — 400 × 75 mm — Silver & Black — Aluminium (Metal) — no fixing” where those details are appropriate for the job. This removes ambiguity when dozens of signs are being ordered at once. If a project drawing, certifier, architect or relevant standard specifies a particular letter height or sign arrangement, follow that requirement instead of choosing solely by plate size.
Order with SignShine
Shop the slim statutory format range or contact us before ordering a large schedule if you want the sizes checked for consistency.
Products to compare
These SignShine products are useful starting points when building this part of a sign schedule: