Miller Edge MT21 – 2″ × 1″ Sensing Edge for Rolling Doors
The Miller Edge MT21 is a durable, flexible sensing edge sized for 2-inch rolling doors with double-angle bottom bars. When lightly touched, it instantly sends an electrical signal to stop or reverse door operation, providing reliable entrapment protection.
The top tab inserts between the double-angle bottom bars, and the flexible vinyl jacket conforms to irregularities in the floor. End flaps extend 5–6 inches beyond the active edge.
MT Series — Which Size Do You Need?
| Model | Body Size | Suits |
|---|---|---|
| MT21 | 2″ W × 1″ H | This product — 2 in bottom bars, lowest profile |
| MT22 | 2″ W × 2″ H | 2 in bottom bars, taller profile for better floor contact |
| MT33 | 3″ W × 3″ H | 3 in bottom bars |
Before you order — four things to confirm
1. Length. Measure from the tip of one guide to the tip of the opposite guide, then subtract 2 inches so the active edge does not rub on the guides. Ordered in 1/4 inch increments.
2. Cord location. Left, right, or universal — see below.
3. Color. Black, gray, yellow, yellow/black striped, or chemical-resistant yellow XR5.
4. Monitoring. The designator is set by your operator, not by the edge — see the designator guide.
Not sure this is the right model? See Which Miller Edge Sensing Edge Do I Need?
Cord Location
The cord location is where the lead exits the edge. MT models are available with three positions:
- Left or Right — face the side of the door your operator is mounted to. Is the operator on the left or the right? That is your cord location.
- Universal — plug-in connection at the end of the edge
Get this wrong and the lead runs the opposite way across the opening — and the edge is built to order. See the Gate Edge Handing Guide if you are unsure.
Dimensions
Body 2″ wide × 1″ high, with a 1-5/8″ mounting tab. End flaps extend 5–6 inches beyond the active edge and can be trimmed for a custom fit.
Key Features
- Top tab inserts between double-angle bottom bars on rolling doors
- Flexible vinyl jacket conforms to floor irregularities
- 5–6 inch end flaps create a complete seal, trimmable for a custom fit
- Custom manufactured to your specifications (color, length, cord location)
- Patented Alumaglas™ contact element for superior performance (electric option)
- Sealed assembly – impervious to dust and debris
- UL 325 Recognized Component
- 1-year warranty
- Made in USA
Common Applications
- Rolling fire doors
- Rolling steel doors
- Cornell doors with double-angle bottom bars
- Material handling systems
Monitored or Non-Monitored?
Monitored edges are required for UL 325 listed operators built after August 29, 2010 that have a monitored circuit. For older units and most other applications, a non-monitored edge is used.
MT21 is available as 2-wire monitored (T1, T2 or T3), 4-wire monitored, 2-wire non-monitored, Air-Wave or pneumatic. The designator is set by your operator, not by the edge. See the full designator guide for the reference table and how to determine which one you need.
Important: Edges are custom-made and non-returnable. Confirm compatibility with your door operator manufacturer before ordering.
Complete Monitored Openers Ordering Guide (PDF)
Downloads
MT21 Specifications (PDF)
Gate Edge Handing Guide (PDF)
