Informational
What Is a Request-to-Exit Sensor?
Explainer Guide
What It Means
A request-to-exit sensor, often shortened to REX, is used on the safe side of a door to trigger release when someone approaches or activates the exit path. Instead of pressing a simple button, the release can be triggered by the sensor detecting movement or another exit condition configured by the installer.
| Question | Exit Button | Request-to-Exit Sensor |
|---|---|---|
| How release is triggered | Manual push | Sensor or automatic detection path |
| Typical fit | Straightforward doors | Doors where automatic or higher-flow egress makes more sense |
| Main design question | Is a simple manual release enough? | Is a more automatic exit method needed? |
How It Fits in a Real Installation
REX devices are useful where a simple push button is not the best operational answer, such as doors with higher throughput or sites that want a more automatic exit experience. They still need to be designed around the actual door and safe egress requirements.
Why It Matters
It matters because egress is part of the system design, not an afterthought. The installer has to decide how the door will release from the safe side and whether a manual button or a sensor-driven exit path is more sensible.
Common Misunderstandings
A common misunderstanding is assuming every access-controlled door should use the same type of exit method. The right exit path depends on the door, traffic flow, and how the site actually operates.
Where to Go Next
Read the hardware guide next if you want to see how REX devices, exit buttons, lock choice, and door contacts fit together.
Relevant SecurityWholesalers Product Areas
- Access Control - The main category for controllers, readers, credentials, locks, and supporting hardware.
- Door Strikes - Often the cleanest answer for hinged commercial doors when the latch and frame suit the hardware.
- Door Locks - Helpful when comparing maglocks, monitored locks, and other locking paths.
Related Guides in This Series
Source References
Frequently Asked Questions
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What does a request-to-exit sensor mean in plain English?
A request-to-exit sensor tells the system to release the door when someone is leaving, usually without a credential.
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Where does a request-to-exit sensor fit in a real installation?
REX devices fit doors where a simple exit button is not the most practical egress method.
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Why does a request-to-exit sensor matter to a buyer or installer?
It matters because safe exit design is a core part of access control, not an optional extra.
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What do people usually get wrong about a request-to-exit sensor?
The best exit method depends on the door and workflow, not a universal rule.
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When should a site move beyond the basic version of this?
A site moves beyond the basic discussion when it is comparing several egress methods alongside lock type and door monitoring.
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Which related guide should someone read next?
Read the hardware guide next for the full door-hardware picture.
Quote checklist for What Is a Request-to-Exit Sensor?
Before ordering, ask for a short answer to these questions. They make the quote easier to compare and reduce the chance of buying hardware that does not match the site.
- What exact problem is being solved: alarm sensor selection, deterrence, evidence, access control, safety, compliance or convenience?
- What happens during poor light, bad weather, busy periods, after-hours events or staff changes?
- Who will administer users, review events, export evidence and test the system?
- Which part of the design is allowed to be basic, and which part must be strong because it proves the incident?
If those answers are vague, the buyer should pause before purchasing. Good security equipment becomes much more useful when the operating plan is written down before installation.
Final field note for What Is a Request-to-Exit Sensor?
For What Is a Request-to-Exit Sensor?, the final buying decision should be easy to explain to the person who will live with the system. The quote should identify the must-have outcome, the acceptable compromises, and the support path if users, doors, cameras, sensors or site conditions change later.
This is the difference between a list of products and a security design. The products matter, but the design is what makes them useful.
Final field note for What Is a Request-to-Exit Sensor?
For What Is a Request-to-Exit Sensor?, the final buying decision should be easy to explain to the person who will live with the system. The quote should identify the must-have outcome, the acceptable compromises, and the support path if users, doors, cameras, sensors or site conditions change later.
This is the difference between a list of products and a security design. The products matter, but the design is what makes them useful.
Final field note for What Is a Request-to-Exit Sensor?
For What Is a Request-to-Exit Sensor?, the final buying decision should be easy to explain to the person who will live with the system. The quote should identify the must-have outcome, the acceptable compromises, and the support path if users, doors, cameras, sensors or site conditions change later.
This is the difference between a list of products and a security design. The products matter, but the design is what makes them useful.
Final field note for What Is a Request-to-Exit Sensor?
For What Is a Request-to-Exit Sensor?, the final buying decision should be easy to explain to the person who will live with the system. The quote should identify the must-have outcome, the acceptable compromises, and the support path if users, doors, cameras, sensors or site conditions change later.
This is the difference between a list of products and a security design. The products matter, but the design is what makes them useful.
Real quote scenario for What Is a Request-to-Exit Sensor?
When quoting What Is a Request-to-Exit Sensor?, the useful starting point is door release and safety logic. The buyer should be able to confirm door swing, lock power, exit hardware, emergency release and the authority or installer responsible for compliance. Without those details, two quotes can look similar while solving very different problems.
For example, a front entry may use a strike, a staff-only inward door may need a different lock body, and an emergency exit should never be treated as a normal locked door. This is why a strong SecurityWholesalers guide should talk about the site, the workflow and the equipment together rather than treating the product category as a simple shopping list.
Budget-conscious path
Use the simplest reliable hardware that solves the main risk. Keep administration simple and avoid specialist features unless they change the outcome.
Balanced path
Add better management, verification or expansion headroom where the site is likely to grow. This is usually the best path for small businesses and shared buildings.
Higher-risk path
Document response, audit trail, permissions and fallback procedures. Higher-risk sites need clearer operating rules, not just stronger hardware.
The final What Is a Request-to-Exit Sensor? quote should make the weak points visible. If cabling, power, monitoring, mobile app access, fire release, user management or future expansion are assumed rather than written down, the buyer is carrying risk that should have been solved during design.
Questions to ask before approving What Is a Request-to-Exit Sensor?
- What does the system need to prove or control on an ordinary day?
- What is different after hours, on weekends, during staff changes or during an emergency?
- Who will administer users, review events, export evidence or test the system?
- What happens if the internet is unavailable, a user loses a credential, a sensor triggers falsely or a door does not release?
- Which part of the system is easy to expand later, and which part would be expensive to change?
These questions are deliberately practical. They help separate a polished product list from a design that will remain useful after installation.
Extra buying notes for What Is a Request-to-Exit Sensor?
Exit hardware should be treated as a life-safety and usability decision, not just an accessory. The site needs to know how people leave normally, how they leave in an emergency, and what happens if power or the controller fails. This is the kind of detail that helps a buyer compare quotes properly, because it turns the conversation from ?which model is cheapest?? into ?which design will still be useful after installation??
For What Is a Request-to-Exit Sensor?, the best final check is to ask what would make the system fail in practice. Common answers include poor cabling, weak power planning, missed user permissions, unclear response duties, too little storage, unsuitable mounting positions, or a handover that nobody can follow. A strong quote names those risks and deals with them before hardware is ordered.
For What Is a Request-to-Exit Sensor?, SecurityWholesalers should help buyers feel more confident, not more overwhelmed. The ideal outcome is a quote that is technically sound, easy to explain, and honest about where a simpler option is enough.
Extra buying notes for What Is a Request-to-Exit Sensor?
Exit hardware should be treated as a life-safety and usability decision, not just an accessory. The site needs to know how people leave normally, how they leave in an emergency, and what happens if power or the controller fails. This is the kind of detail that helps a buyer compare quotes properly, because it turns the conversation from ?which model is cheapest?? into ?which design will still be useful after installation??
For What Is a Request-to-Exit Sensor?, the best final check is to ask what would make the system fail in practice. Common answers include poor cabling, weak power planning, missed user permissions, unclear response duties, too little storage, unsuitable mounting positions, or a handover that nobody can follow. A strong quote names those risks and deals with them before hardware is ordered.
For What Is a Request-to-Exit Sensor?, SecurityWholesalers should help buyers feel more confident, not more overwhelmed. The ideal outcome is a quote that is technically sound, easy to explain, and honest about where a simpler option is enough.