Norton Product Terms


Adjustable Hold Open

Amount of time a door will stay in the full open position after an activation.


Blow Open for Smoke Ventilation

Door opens when signal is received from alarm system, allowing air or smoke to flow through opening. Door will stay open until signal from alarm system is stopped.


Dynamic Braking

Braking or slowing of the door if excessive door speed occurs resulting from a wind load or an abusive open condition.


Emergency Interface Relay (fire panel input)

Door closes and ignores any activation input until signal is discontinued.


Executive Mode Feature

When door receives activation signal, it opens and remains open until either a second signal is received or door is manually moved in closing direction.


Infinite Hold Open

Door will hold open at set position until power is turned off.


Latch Assist

At closed position, after an activation, the door is pulled in. After the door is closed, the door is pulled in to assist with latch release/engagement.


Obstruction Detection

Open - door closes if it hits an obstruction while opening.

Close (stop on stall) - door will stop once it hits an obstruction and will rest against the obstruction until removed.


On/Off Switch

Disables operator activation.


Open Delay

Delays operator opening for locking hardware.


Outside Push Button Disable

When contact is closed, outside push button is disabled.


Overload Safety Shut-Off

6000: After 3 minutes of receiving a door activation signal, inverter times out and door closes. Prevents motor/inverter damage.

5700/5600: After 2 minutes of receiving a door activation signal, inverter times out and door closes. Prevents motor/inverter damage.


Power Assist

Senses the door is being opened manually and applies small amount of power to assist user in opening the door with force less than 5 lbs.  Door opens only as far as it is moved manually then closes once released,


Power Close / Latch Boost

Additional force to assist door closing between 90° and 70° and 10° and 0°.  Additional closing force to overcome conditions that might otherwise prevent the door from latching (ex: weather stripping, stack pressure).


Presence Detector Input

Input for external sensor to detect presence at door open or close position only.


Push & Go

As the door is manually opened, the operator "senses" movement and opens door to the full-open position.


Selector mode switch

Off - Disables signal inputs unless Blow Open is activated.

On - Activates signal inputs

Hold Open - Activates the unit (unless blow closed is activated on 6300) to the hold open position.


Two Selectable Output Relay

Multi-function relay outputs


Single Relay Output

Closes to indicate a valid activation


Vestibule Delay

When the push button is pressed, first door in vestibule will open. Second door will open once vestibule door delay has expired. Delay is adjustable.

Door Closers


American National Standards Institute which publishes standards for the entire door opening.


Applied Stop

Surface mounted stop attached to a cased opening frame.



Hydraulic circuit designed to cushion the door's opening swing at about 70 to 75 degrees.


Closing Force

Energy generated by a closer to close and latch the door.


Concealed in Door

Closer with the cylinder concealed in the top rail of the door with either an exposed or concealed arm.



Preparation of the top rail of a door or frame for concealment of the closer, arm, or track.


Cylinder Assembly

Main closer component complete with any mounting plates or electronics.


Delayed Action

Delays closing from maximum opening to approximately 70 to 75 degrees.


Double Lever Arm

A two part arm hinged at the elbow that provides superior leverage.


Finish Plate

Decorative plate applied to overhead concealed closer to conceal closer mounting plate and screws.



Arm part that connects main arm to the shoe attachment in a double lever arm system.



Closer is designed for only right or left swing doors.


Hold-Open Arm

Double lever arm that provides hold-open function, adjustable at elbow or shoe.


Hydraulic Fluid

Oil metered by valve system to control door.



Allows adjustment of door speed from 10° - 12°to closed position


Latch Speed

Separate adjustment that controls the last few degrees of the door's degrees of latch.


Main Speed

Adjustment to control closing swing of the door to within a few degrees of latch.


Maximum Opening

Furthest degree of door opening allowed by the mechanical limits of the closer.


Multi-point Hold Open

Infinite hold-open from 0 up to the maximum opening.



Closer is designed for both right and left hand swing doors.



Cylinder assembly with spring power adjustable over a range of sizes.


Opening Force

Force required to open door against the closer's spring power.


Overhead Concealed

Closer with cylinder concealed in the frame and either a concealed or exposed arm.


Parallel Arm

The closer is mounted on the push side of the door. The arm is attached to the frame soffit parallel to the door.


Regular Arm

The closer is mounted on the pull side of the door. The arm is attached to the frame face or hinge side of the door.


Regulating Screw

Vale that adjusts flow of hydraulic fluid with cylinder to control door closing speed.



Attaches forearm to frame or door face in a double lever arm system.



Closer with a specific minimum closing power.



Horizontal surface of a frame between vertical stops on a double rabbeted frame.


Spring Power

Closing force exerted by the spring inside cylinder to close door.


Standard Cover

Conceals cylinder with only arm/pinion attachment exposed.


Standard Track with Bumper

Non-hold open track with bumper assembly installed.


Standard Track

Non-hold open track.



Provides adjustment of door speed from full opening position to 10° - 12° from the closed position.


Top Jamb Arm

The closer is mounted on the opposite to hinge side frame face, above the door. The arm is attached to the top rail of the door at a right angle to the door.


Track Bumper 

Mounts in track to cushion opening swing, but reduces maximum opening.



The closer is packed with all necessary hardware for mounting in any of the three traditional mounting styles: Regular Arm, Parallel Arm or Top Jamb.