Glossary Terms - F

Face (of a door)

The area of a door you see when the door is in a closed position. When door is in the closed position the face is also the surface parallel to the surface of the wall.

Face (of a lock)

The exposed surface of a lock that shows in the doors edge after the lock has been installed.

Fail Safe

Lock or locking device that remains unlocked on loss of power.

Fail Secure

Lock or locking device that remains locked on loss of power. Also known as Non-Fail Safe.

Finish Hardware

Hardware that has a finished appearance and functional purpose, used in the creation of door openings as required to achieve security, life safety, fire safety and decorative purpose. Usually specified in section 08710 of a project manual (Also called: BUILDERS HARDWARE and ARCHITECTURAL HARDWARE).

Fire Exit Hardware

(also PANIC DEVICE) – A door locking or latching mechanism that is designed to always be operable from the inside or EGRESS side of the door by applying pressure on a PUSH BAR or CROSS BAR. Fire rated/labeled PANIC DEVICES have been tested, certified and approved for use on fire rated doors. A PANIC DEVICE can differ in function of the latching features and may be “Rated for Panic” only and not be suitable for use on a fire rated, labeled door opening.

RIM TYPE – Has the locking mechanism and latch located on the inside or push side of the door.

MORTISE TYPE – Has the locking mechanism mortised into the edge of the door. The latch projects from the door edge much the same way as a mortise lock.

VERTICAL ROD TYPE – May be either surface or concealed (referring to the exposure of the top and bottom rods). The latching mechanisms are attached to the ends of rods extending to the top and bottom of the door leaf and are connected to the active case of the device located on the inside face of the door, much like the Rim Type device. When the bar is pushed or depressed the rods are retraced thereby allowing the door to open.

Flex Head Cylinder

A cylinder with built-in adjustment for minor variations in door and trim thickness.

Floor Closer

A door closing device that mounts below the door leaf, usually recessed into the floor, which regulates the door with many the same features as a surface type door closer.

Front (of a Lock)

The plate surrounding and through which the latch/locking bolts of a lock project.

Fusible Link

A device consisting of pieces of metal held together by a low melting-point solder and when exposed to high temperature releases a hold-open function.