Commercial Overhead Door Sensor Height – Winnipeg Inspection Insight
- Mar 20
- 2 min read
Commercial Overhead Door Safety Sensors: Why Height Matters More Than You Think
When people think about overhead doors, especially in commercial settings, they assume if it opens and closes — it’s working properly.
But that’s not always the case.
On a recent inspection, I came across a commercial overhead door with safety sensors installed at approximately 20 inches off the floor.
At first glance, it might not seem like a big deal.
The door still operates. The sensors are there. Everything “looks” fine.
But here’s the problem…
The 6-Inch Rule (And Why It Exists)
For overhead doors that rely on photoelectric safety sensors (photo eyes), the generally accepted standard is:
👉 Maximum height: 6 inches (150 mm) from the floor
This isn’t just a random number.
That height is designed to ensure the sensor can detect:
A person
A child
Low objects (tools, boxes, pallets)
When sensors are installed too high, they can completely miss obstructions near the ground.
What Happens at 20 Inches?
At roughly 20 inches, the sensor beam is well above many potential hazards.
That means:
A small child may not be detected
A low obstruction could be ignored
The door may continue closing when it shouldn’t
In short — the safety feature is compromised
“But It Still Works…”
This is the part I hear all the time.
Yes — the door will still open and close.
Yes — the sensors may still trigger if something crosses the beam.
But that doesn’t mean it’s set up correctly.
Safety devices are only effective when installed properly.
Commercial vs Residential — Important Note
This situation involved a commercial overhead door.
While both residential and commercial systems use similar safety concepts, installations can vary depending on:
Equipment type
Manufacturer requirements
Application
That said, when photo eyes are used, keeping them low to the ground (around 6 inches) is key to proper function.
Why This Often Doesn’t Get Fixed
Here’s the honest reality:
The door operates, so it’s often overlooked
Installers may mount sensors higher for convenience or protection
Property owners may not see it as an issue
So in many cases… it stays exactly as is.
Why It Still Matters
This is one of those small details that most people never notice —
but it can make a big difference in preventing injury or damage.
As inspectors, it’s our job to point out these things, even if they don’t get changed right away.
Because when it comes to safety, details matter.
Final Thoughts
A properly installed safety system isn’t just about having the right components —
it’s about installing them at the right height, in the right place, for the right purpose.
If you’re dealing with a commercial overhead door, it’s worth taking a second look at those sensors.
You might be surprised what you find.
365 Home Inspection – Winnipeg
📞 204-396-3161
The grind is real. Details matter. Always.
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