Fire Door Keep Locked - Safety Signs by Caledonia Signs

A “Fire Door Keep Locked” sign is important because it clearly communicates that a specific fire door must remain locked to maintain the building’s fire safety and security. Certain fire doors protect sensitive or hazardous areas—such as electrical rooms, boiler rooms, or chemical storage—where restricting access is essential to prevent unauthorised entry and reduce risks. Keeping these doors locked ensures that fire compartments remain secure and that fire and smoke are contained effectively.

The sign also serves as a reminder to staff and occupants that these doors are a critical part of the passive fire protection system and must not be left unlocked or propped open. Unlike standard fire doors that are usually kept closed but unlocked for ease of access, fire doors that must remain locked help reinforce the safety of high-risk zones by combining security with fire resistance.

These signs should be installed directly on or adjacent to fire doors that are required to stay locked, often found in commercial, industrial, and institutional buildings like hospitals, factories, schools, and large office complexes. Typical locations include doors leading to plant rooms, hazardous material storage, or other restricted areas where fire doors also serve a security function.

Using a “Fire Door Keep Locked” sign supports compliance with fire safety regulations and security policies. It helps maintain the effectiveness of fire compartmentation and protects occupants and property by preventing unauthorised access while ensuring the door’s fire-resistant qualities are preserved.

Materials Explained

Below is a more detailed description of the materials this particular safety sign is available in. Helping you decide which sign option is most suitable for your application.

Rigid Plastic: This lightweight, gloss white PVC is resistant to weather, moisture, chemicals, and general wear and tear, making it suitable for harsh environments. Its smooth, solid surface allows for crisp printing of text and graphics, enhancing readability and visual impact. Businesses who choose Rigid Plastic signs benefit from fewer replacements and minimal maintenance, making it a practical investment for reliable and effective safety signs.

Self-Adhesive Vinyl: Self-adhesive vinyl is easy to apply and it’s budget-friendly. Its adhesive backing allows for easy application to a variety of surfaces such as glass, metal, plastic, and painted walls, which simplifies installation and reduces setup time. Self-adhesive vinyl provides a clean, professional finish that suits many indoor environments including offices, retail, industrial sites, and vehicles. It is more affordable than many other material types and allows for custom shapes, colours, and graphics.

To achieve high performance in low light conditions and conform to ISO 16069 we recommend using Ultra Bright.

Ultra Bright Photoluminescent Rigid Plastic: Ultra Bright rigid plastic has a photoluminescent (glow in the dark) pigmentation which offers a highly effective, reliable, and energy-free visibility in low-light or blackout conditions, making them ideal for emergency exit applications. The afterglow properties exceed PSPA Class C grade, as measured to DIN 6751, provides razor sharp definition in blackout conditions.

Ultra Bright Photoluminescent Self Adhesive: Ultra Bright self adhesive vinyl is a flexible PVC with photoluminescent (glow in the dark) pigmentation. The self-adhesive backing enables quick, tool-free application on smooth, clean surfaces like walls and doors. The afterglow properties exceed PSPA Class C grade, as measured to DIN 6751, provides razor sharp definition in blackout conditions, making them ideal for emergency escape applications.

2mm PET: An excellent material for signage due to its high durability, impact resistance, and optical clarity. It performs well in both indoor and outdoor environments, offering strong resistance to moisture, chemicals, and UV exposure. This makes it ideal for high-traffic areas or locations where hygiene and visibility are crucial. Additionally, PET is lightweight, easy to handle, and fully recyclable, making it an environmentally friendly choice for modern signage solutions.

Rigid Plastic with Self Adhesive Backing: Our standard rigid plastic is a gloss white, smooth, solid material that allows for crisp printing of text and graphics - resistant to weather, moisture, chemicals. A strong peel & stick adhesive backing eliminates the need for tools or hardware, providing a long-lasting bond to most smooth surfaces, saving time and labour costs.