Door Panic Devices
There are basically four types of exit devices no matter which manufacturer you use. They are
rim, surface vertical rod, concealed vertical rod, and mortise. Each type of device has many
different "trim" options. The trim is what goes on the outside of the door so you can get into
the door from the outside if this is the type of application you require. This trim can vary
from a simple pull plate with a cylinder in the middle, a keyed lever or knob so it looks just
like a door with a regular lock from the outside, or levers (or knobs) with separate cylinders
and escutcheon plates. Some doors with exit devices are "exit only" which means, like it says,
that the door is used as an exit only and there is no way to get into the door from the
Rim Device: This type is used on single doors or pairs of doors that have a vertical
mullion (either removable or fixed) in between the doors. The strike plate is surface mounted
on the frame (or mullion). It can also be used on the active door of a pair with a double door
strike mounted on the inactive door.
Surface Vertical Rod (SVR) Device: This is mostly used on pairs of doors but can
be used on single doors for extra security. There are top and bottom rods that go from the
device to the top of the frame and to the floor. When you push the device, the rods retract
releasing the rod ends from their locked position. The rods are surface mounted to the face of
the door so they are exposed and can be seen from the inside of the door.
Concealed Vertical Rod (CVR) Device: This is the same as the surface vertical rod
except that the rods are inside the door so they are concealed. This is used for appearance
and/or when there are applications where the surface vertical rods could get damaged such as
a place where people are pushing carts or other objects through the door. These devices
require a good deal of prep work to the doors so they tend to be expensive as a package. They
also can be difficult to install correctly if you are not familiar with this type of device
Mortise Device: This consists of a mortise lock body just like a
mortise lock that mounts into the edge of the door. The face of the
door is drilled for holes in the proper locations for mounting the device and any outside
trim that is required. These holes will vary depending on the function of the device. These are
heavy duty devices and usually used where they will get a lot of use or where high security is
needed. The strike is mounted in the rabbet of the frame just like a mortise lock.
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