This Door Must Be Kept Shut When Not In Use Door Sign
Ensure doors remain securely closed with this highly visible This Door Must Be Kept Shut When Not In Use door sign.
• Clearly instructs that doors must be kept shut whenever they are not in use
• Ideal for commercial buildings, warehouses, schools, public premises and workplaces
• Bold white text on a blue mandatory symbol ensures excellent visibility
• Available in Extra Glow in the Dark Self Adhesive (Class C), Extra Glow in the Dark Rigid Plastic (Class C), Extra Glow in the Dark Rigid Plastic (Self Adhesive Back), Rigid Plastic (1mm), Rigid Plastic 1mm (Self Adhesive Back), Rigid Plastic (2mm), Self Adhesive Vinyl and Self Adhesive Vinyl (Aluminium Effect)
• Helps improve safety, security, temperature control and noise reduction
Product Overview
The This Door Must Be Kept Shut When Not In Use Door Sign provides a clear mandatory instruction reminding staff, visitors and building occupants to keep designated doors shut whenever they are not in use. Featuring bold white text on a blue circular background, this highly visible sign helps improve security, maintain temperature control, reduce noise transfer and support safe, efficient building management in commercial and public environments.
Where to Use
- Commercial buildings
- Warehouses
- Schools and colleges
- Public buildings
- Office workplaces
Key Features
- Displays a clear mandatory instruction
- Recognised blue mandatory sign design
- Bold white text for excellent visibility
- Suitable for internal and external doors
- Available in multiple durable material options
Materials & Options
- Extra Glow in the Dark Self Adhesive (Class C)
- Extra Glow in the Dark Rigid Plastic (Class C)
- Extra Glow in the Dark Rigid Plastic (Self Adhesive Back)
- Rigid Plastic (1mm)
- Rigid Plastic 1mm (Self Adhesive Back)
- Rigid Plastic (2mm)
- Self Adhesive Vinyl
- Self Adhesive Vinyl (Aluminium Effect)
Compliance
This sign supports compliance with UK health and safety regulations, including:
- Health and Safety at Work etc. Act 1974
- Safety Signs and Signals Regulations 1996
Frequently Asked Questions
Where should this sign be installed?
Install it directly on or adjacent to doors that must remain shut when not in use so the instruction is clearly visible to staff and visitors.
Is this sign suitable for low-light conditions?
The Extra Glow in the Dark material options remain visible after exposure to normal lighting, making them ideal for use during power failures and emergency situations.
What does this sign indicate?
It provides a mandatory instruction that the door must be kept shut when not in use to help improve safety, maintain security, reduce noise and assist with temperature control.
Trade Discounts
Rainbow Safety supplies safety signs to trade professionals across the UK.
Our trade customers include:
- Fire safety service companies
- Fire risk assessors and safety consultants
- Electrical wholesalers
- Facilities management companies
Approved trade customers receive:
- Preferential trade discounts
- Better margins for reselling safety signs
- Marketing support to help you sell more signs
- Access to our full range of safety signs
With the support and marketing tools provided, our sales have grown to over £3,000 per month.
Fire extinguisher servicing margins are not what they used to be, so supplying safety signs has become a valuable additional revenue stream for our business. On one warehouse safety survey alone we £5,100 in a single order.
Previously we were regularly asked to supply safety signs but couldn’t compete with internet prices while maintaining healthy margins. Working with rainbowsafety.co.uk.
Loyalty Rewards
Rainbow Safety rewards regular customers across the UK who order safety signs on an ongoing basis.
- Schools and colleges
- Facilities management companies
- Contractors and maintenance teams
- Offices and commercial premises
- Preferential pricing for regular customers
- Free design service for custom safety signs
- Access to exclusive promotional offers
- Dedicated account manager if required
“Rainbow Safety has become our go-to supplier for safety signs.”
We regularly need safety signs for maintenance work, refurbishments and ongoing compliance updates. Since ordering from Rainbow Safety, the process has been straightforward, reliable and cost-effective.
The loyalty rewards and special offers have helped us save money across repeat orders, while the wide product range means we can usually source everything we need in one place.
Fast ordering, consistent quality and ongoing rewards have made Rainbow Safety a valuable supplier for our business.
Reviews
Very professional looking sign with sharp lettering and strong construction. It has improved awareness around restricted access doors in our building.
The sign does exactly what we needed and is easy to notice from a distance. Delivery packaging could have been a bit better during transit.
Good sturdy sign that feels durable and suitable for long-term use. The print quality is excellent, although I expected slightly thicker material.
Excellent quality door sign with very clear wording and a smart professional finish. It was easy to install and highly visible in our workplace.




Reliable and well-made sign that arrived promptly and was simple to mount. It still looks great despite constant daily use.