Air Pressure Resistance

Pressure differentials can have an impact on the operation of the door as well as hinder the proper sealing of the door in the striker. The differential that occurs between the two sides of the opening is measured by a manometer while the door is in the closed position and whose units are measured in inches of water column (wc). Without the need for additional components, the Won-Door FireGuard™ door can withstand air pressure that measures between 0” wc and 0.05” wc. If the pressure differentials measure between 0.05”, 0.10,” and 0.15" wc, anti-sway brackets will be installed every four feet to minimize movement at the bottom of the door. See Anti-Sway Brackets.

Anti-Sway brackets

Metal brackets mounted internally to the door that connect panels across from each other, forming a shear panel to stiffen the door at the bottom.

Auxiliary Relay Module (xrm)

All Won-Door FireGuard™ doors are able to remotely monitor the following four conditions: loss of AC power, receipt of fire alarm signal, fully closed position, and receipt of fault condition. The XRM allows for the programming of two additional output relays that could monitor a multitude of additional functions or status conditions.


Bi-parting configurations occur when the door is divided in two segments that meet in the middle of the opening when the door is fully closed. This condition can consist of equal width segments, an even bi-parting door, or unequal width segments, an uneven bi-part. Bi-parting doors are available in both straight & curved configurations and only available with narrow leadposts.


This spring-loaded rocker switch is located on the side of the door near the leadpost and is the default operating device included with every Won-Door FireGuard™ model door. CCOM is an acronym for Close, Clear, Open, Mute. Pushing the upper side of the switch will close the door or clear any fault relays. Pushing the lower side of the switch will open the door or temporarily mute the beeping of the current fault condition. Following an alarm event, the CCOM switch is also used to reset the door once the building's master alarm has been reset.

Curved track

Curved track configurations include standard curves with 5’ and 10’ radii. Custom curves are also available. Only available with a narrow leadpost.


Tube steel support forming a gusset to reinforce the leadpost. The diagonal bar is attached to the lower portion of the leadpost and at the back of the support trolley in the track. It ensures that the door remain plumb and true and acts like a truss within the door to keep the leadpost rigid during operation and as the leadpost strikes into the receiver.


Egress is the act of exiting a space or building. Egress width is the amount of horizontal space that is required to safely exit all the occupants in that area. During a fire alarm scenario, the egress width determines the distance required to open the door when the exit device is pushed.


An area in front of an elevator car or set of elevator cars that, when enclosed, forms a lobby that can protect occupants from the effects of smoke and fire. In order for this area to be considered a lobby, the distance from the face of the elevator car to the fire door must be a minimum of 44”. See Point of Access.


When pressed, the door will open a predetermined distance allowing egress. These green paddles can be located on one or both sides of the door and anywhere along the width of the opening, at the ADA-compliant height. These devices may be disabled for security purposes. However, in fire alarm mode, pressing the exit device will open the door a predetermined, required exit width, pause for three seconds (and up to 30 seconds), allow for egress, and then seek the closed position. Available options include exit devices backlit with LEDs, printed in other languages, or embossed in braille. With the door in the closed position, device placement is measured as the distance from the strike wall.


An intentional, empty space that divides two separate buildings allowing for expansion and contraction of each building. If plans indicate that the door opening crosses an expansion joint, Won-Door Engineering must be consulted.

Fire Rating

The rating, usually measured in time, given to a particular construction type or building product that has been tested by an accredited laboratory. Won-Door FireGuard™ doors are available with 20, 60, 90, 120 and 180 minute ratings. Won-Door FireGuard Moveable FireWalls™ are available with 60 and 120 minute ratings.


The flat leadpost (front part of the door that meets the strike) should be used when the pocket depth must be minimized. The flat leadpost also serves as an integrated pocket cover door, eliminating the need for a swinging pocket cover door. With the door in the closed position, this leadpost seats between two vertical, parallel striker rails on the strike wall. These two rails are 24” apart and are centered in the path of the door. The flat leadpost is available on straight, single parting doors only, that measure no greater than 40’ wide and 12’ in height. It includes leading edge obstruction detection. The face of the flat leadpost can be field painted or accept wall coverings up to 0.046 mils in thickness.


Back portion of the folding fire door that resides in the storage pocket and creates the fire/smoke seal at the front of the pocket when the door is in the closed position. The floating jamb is pulled out of the pocket to access the controller and motor drive units.


When high speed operation is referenced or required, the speed at which the motor drive unit operates the door is increased from 9” per second to 18” per second. These scenarios typically involve security applications or openings with large exit width requirements.

Intermediate Exit Device

Access to the exit device is always required. When obstructions exist (stub walls, guard rails, stairs, elevators, etc.), the exit device may have to be intermediately located away from the obstruction to provide that access. Also, multiple exit devices may be placed along the entire width of the opening. For example, in the case of a door being used in front of multiple elevator cars, an exit device should be placed in front of each elevator car. With the door in the closed position, device placement is measured as the distance from the strike wall.

Key Switch

This is a spring-loaded, three-position, momentary contact, wall-mounted switch. Specified in lieu of the CCOM rocker switch to limit operation of the door to authorized users only, the key switch can also be used to open and close the door and clear any fault codes and temporarily mute the beeping of any fault condition. By default, key switches are provided by others or can be provided by Won-Door as an option.

Narrow Leadpost

The narrow leadpost (front part of the door that meets the strike) should be used in curved openings, angled pocket/strike walls, bi-parting configurations, when the strike is located in a column or a window mullion, when the strike area is limited, and any pocket/strike condition that requires special finishes. This leadpost allows for the use of pocket cover doors, provided by others. The narrow leadpost includes leading edge obstruction detection and is available in all door/track configurations. A fire-rated recess of 4 1/4” x 4 1/4” is required on the strike wall at a 90° angle and centered in the path of the door.

Obstruction Detector

The leadpost contains obstruction detection sensors. Obstruction detection is a standard feature of each assembly. When an obstruction blocks the path of the door while it closes, the door will stop. During a fire alarm scenario, the door will stop, pause, and continue to close.

Operating Device

General term for a device used to activate a door. Some examples include a card or fob reader, thumb print scanner or other biometric reader, or motion sensor.

Optical Obstruction Sensor

This is installed near the floor at the side wall of the storage pocket. These sensors emit a light beam across the opening to a reflector located at the identical position on the strike wall. If the light beam is interrupted for more than four minutes an alarm will sound indicating an obstruction fault condition. For opening widths greater than 23’, a repeater and 10-30V DC transformer is required at the strike wall in lieu of the reflector. Available with straight tracks only.

PET Tool

A handheld programming tool used to activate and set up all features and options of the folding fire doors.

Pre/Post-Tension Decks

Pre- and/or post-tensioned decks are light weight, concrete decks that use a series of large cables in tension, or under stress, placed into the deck for reinforcement, allowing the decks to be lightweight and utilize less building material. If the installation of the Won-Door requires anchors in the deck for the structural support, drilling or placement of these anchors must be excluded from the technician’s scope of work. In the process of drilling the deck for setting the anchors, the potential for hitting a cable is high and would compromise the strength of the deck. Alternatively, the deck could be x-rayed and marked after the concrete is cast or anchors could be cast in the concrete during the pour.

Pocket Cover Door

A swinging door used to cover the opening of the Won-Door storage pocket while the fire door is in the fully open position. Pocket doors can only be used in conjunction with narrow leadposts. The pocket cover door must swing 90° clear of the path of the fire door - 18” at the face of the storage pocket. These doors have been made from a variety of materials, in countless colors and finishes. For this reason, pocket cover doors are provided by others.

Pocket Depth

Depth of space used for the storage pocket as measured from the face of the finished pocket to the back of the finished pocket.

Point of Access

Won-Doors that are placed immediately in front (within 44”) of elevator cars are installed at the point of access. These doors prevent smoke and toxic gases from spreading into the vertical space of the elevator shaft.

SE Smoke Requirement

The SE smoke requirement is mandated when the Won-Door is located in front (within 44”) of an elevator car(s). This prevents smoke and other toxic gases from contaminating the elevator shaft and migrating to other spaces in the building. See Point of Access.

Single Door Display

A wall-mounted, LCD display that indicates current door conditions - including current status (open, closed, locked, etc.) and any fault conditions that may be present. Also includes a port to which a PET tool or a wireless transceiver can be inserted.

Surface Mounted Striker

A 16-gauge striker used to receive the narrow leadpost. It is surface mounted at the centerline of the door on the striker wall. Surface mounted strikers are used primarily for round columns or construction that would not allow the 4 ¼” recess to be built into the striker wall.

Vision Panel

A metal frame surrounding a 1” x 4” piece of fire-rated glass that mounts on both sides of a door panel and provides visibility through a closed door. A vision panel is only required in smoke barrier applications in an I-2 occupancy.

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