Installing the Glynn-Johnson SensaGuard 280 Holder/Release

This self-contained, 9-volt battery operated door holder with built-in release mechanism provides a wireless method for propping open a fire door.


Sometimes it is better to keep an interior door propped open because of the amount of foot and cart traffic, than to force everyone to open the door. Unfortunately, because of code requirements, fire doors cannot be held open using a door closer with hold-open function, a door stop or drop down...


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Sometimes it is better to keep an interior door propped open because of the amount of foot and cart traffic, than to force everyone to open the door. Unfortunately, because of code requirements, fire doors cannot be held open using a door closer with hold-open function, a door stop or drop down doorstop. Attaching a door- mounted doorstop onto a fire door is against code. If the door closer has hold-open, the closer must be removed and a non-hold open closer installed. If there is a drop down doorstop, remove it and re-attach the screws to fill the holes.

Always contact your local Authority Having Jurisdiction (AHJ) before installing any product onto a fire door.

There are several options for propping open a self-closing fire/smoke barrier door. The most common method is the use of hard-wired magnetic door holders. A magnetic door holder is an electro magnet, 12 or 24Volts, that is mounted into the adjacent wall and wired into the building’s fire alarm panel. A metal plate with swivel is mounted onto the door. When the door is open, the magnetic door holder aligns with the door mounted metal plate. Power is provided to keep the magnetic door holder energized, which magnetically holds open the door. When a smoke alarm detects fire or smoke, power is automatically cut, the magnetic holder releases and the door closer swings the door shut.

Most magnetic door holders are installed during construction as the cost to retrofit can be expensive, depending upon the distance the door is located from the fire alarm panel.

A wireless method for propping open a fire door is the UL Listed Glynn-Johnson SensaGuard™ 280, a self-contained, 9-volt battery operated door holder with built-in release mechanism. The surface-mounted SensaGuard 280 was developed as a standalone retrofit product that has a built-in battery powered smoke detector that operates the mechanical door holder. The SensaGuard 280 is compliant with the NFPA 101 Life Safety Code Article 5-2.1.8 Self-Closing Devices, Exception C, 2. The State of California Fire Marshal Listing and with UL listed door closers.

The Glynn-Johnson SensaGuard 280 is designed to operate with a fire rated door closer. This smoke detecting door holder and release mechanism is installed onto the secure side of the door to provide protection. When smoke or particles of combustion are detected in the ionization chamber, the door holder is released. The door closer closes and latches the door. Depending upon the configuration of the doorway, the SensaGuard 280 hold open function is adjustable at a single point from 90 to 180 degrees when mounted onto the Push Side of the door or from 90 to 130 degrees when mounted onto the Pull Side of the door.

The one-piece SensaGuard 280 is approximately two feet long, two inches wide and about two inches tall. On one end has the microprocessor-controlled holder mechanism; the other has the battery compartment, smoke chamber and controls. In between is the slide block track.

The SensaGuard 280 has two recessed labeled buttons on the surface, “Test” and “Reset.” The “Test” button tests for proper operation of the release mechanism. When this button is pressed and held for two seconds, the slide block is released, allowing the door closer to close the door. The “Reset” button is used to reset (re-arm) the holder after testing or after smoke was detected in order to re-arm the holder mechanism. The “Reset” button must be pressed in order for the slide block to be retained.

To resist vandalism and unauthorized changes, the SensaGuard 280 has tamper protection using a fail safe switch mechanism for the battery compartment. If the cover is removed, the slide block automatically releases. To ensure proper operation and to indicate sufficient battery voltage, the LED flashes once every 40 seconds. Should battery power drops below 7.2 volts, the slide block automatically releases.

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