There is a Krieger custom door for each of your design needs that are backed by a combination of imaginative research and development, sound engineering practice, and both laboratory and field testing.
Concealed Vertical Rod
These panic devices (such as Von Duprin - 8847 or 9947) require a large open area, full height inside the door, which unacceptably reduces the effective area of the sound retardant core and precludes the use of a mortised automatic, or cam lift door bottom. We do not recommend their use where noise reduction is critical and we cannot certify an STC rating with this option.
Surface Vertical Rod
To effectively use these panic devices (such as Von Duprin - 8827 or 9927) the surface mounted roller latch should be mounted on a "Z" bracket (provided by Krieger) at the head and never on the sound seal itself. Screws occuring within the bottom 3" of the door must be cut short and filed or they will prevent the automatic door bottom from operating properly.
Rim Type (Single Doors Only)
These panic devices (such as Von Duprin - 88 or 99) require the surface mounted roller latch be mounted on a "Z" bracket (provided by Krieger). These devices cannot be used for pairs of doors due to the use of overlapping astragals on the "push" side of the door. If rim devices must be used at pairs, a Krieger mullion (not VD 1654) is required. A better alternative is to use two mortise devices (such as VD 9975) with a mullion.
Krieger recommends the Mortise Exit Device (such as Von Duprin 9975) for better latching and sound control, thus eliminating a "Z" bracket for the mounting of a roller strike.
Fire Rated Surface Vertical Rod
These devices use a softit latch assembly in the head of the frame which cannot be mortised into the perimeter seal. If used, they can be mortised into a metal box mounted below the seal and attached to the frame with a "Z" bracket (provided by Krieger).
Devices for Pairs Without Mullions
If both leaves of a pair of doors with panic devices are "active", a coordinator will be required because of the overlapping astragal(s). Use a mortise exit device on the active leaf and a surface vertical rod device on the inactive leaf to allow either leaf to be active. This configuration may exceed the opening pressure required by the American Disability Act. Please consult the factory prior to specifying.
For a mortise exit device with a standard strike and surface mounted vertical rod device combination in the same direction, we recommend using a coordinator (such as Trimco 3092) which has a long enough arm to accommodate the overlapping astragal(s). Acoustical pairs with leaves exceeding 46" widths (Frame openings > 92") must utilize a mullion.
If surface vertical rod devices are specified on both doors, then the inactive leaf cannot be opened until the active leaf is opened since both leaves are latched top and bottom and have overlapping astragal(s). Krieger cannot certify an STC rating without astragal(s).
Design may not meet ADA requirements, please contact factory for details.
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