Krieger perimeter seals are 1 ⅛" high. Rose/rosette plates for lever trim (with spring assembly) will overlap Krieger perimeter seals at 2¾" backset; and, if a knob is used, there is very little grasping clearance. Krieger recommends using a 3¾" backset for either levers or knobs on acoustical doors.

Mortise locks are only available with a 2¾" backset, which is why we recommend using lever handles instead of knobs to ensure proper clearance. Rose/rosette plate diameters should not exceed 3".

Unit locks such as the Corbin 300 are not recommended under any circumstances. These locks require that the entire edge of the door be notched out. The escuthcheon is too close to the edge of the door and hits the perimeter seal preventing contact between the door and the seal. Krieger cannot certify any acoustical ratings with this type of lock.

Because the Simplex Unican Series 1000 Digital control lock is very sensitive, we recommend specifying a “roller strike” when using this lock in conjunction with NC-6 magnetic seals. We also suggest substituting a latch bolt with a 3¾" backset. As an alternative, consider using the Yale eBOSS E5400LN, Alarm lock Trilogy DL 2500 series digital cylindrical lock with a 3¾" backset, or Schlage “AD” pushbutton lock.

The combination of dual seals, 2¼" in height and the increased door thickness somewhat limits the selection of latching hardware that is compatible with this design. We recommend using a cylindrical lock with a 5" backset, a 5" backset Mortise Lock series 9100 by Accurate Lock, or consulting Krieger before making your final selection.

Krieger suggests using an electrified lock in lieu of an electrified strike. Non-operable ASA strikes (paired with electrified locks) allow the seals to be adjusted properly without “play” between the lockbolt and the strike, which significantly reduces the risk of incurring complications related to the function of the assembly, or its acoustical performance.

Electrified strikes have “play” between the lockbolt and the operable strike. This can cause binding and prohibit the proper opening and closing of the strike due to the preload force of the acoustical seal, which, in combination with the unseated pressurization forces from HVAC systems or exterior winds, can be present within a facility. For this reason, Krieger does not recommend pairing electrified strikes with acoustical door assemblies.

If electrified strikes must be used, please contact us to discuss your project.

Electric Latch Releases
A new development in electric latch releases for acoustical assemblies is the SECURITRON “UNL” Unlatch Strike for cylindrical locksets and the “MUNL” Mortise Unlatch Strike for mortise locks.

Electric Strikes and Door Pairs
Some electric strikes for pairs of custom doors (such as the Von Duprin - 6220 Series) require a cut-out through the door. We do not recommend these types of strikes because of this cut-out and they will not work with the overlapping astragals.

Contact us to review electrified locks you are considering to ensure their compatibility with perimeter seals, proper operation, and noise reduction requirements.

Electric locks for acoustical doors and other custom doors require low voltage power routed through the door. At conventionally hinged (level swing) openings this transfer is best done with wired level swing hinges and Krieger’s electrified Cam Lift Hinge for acoustical doors with Cam lift Hinges, or if required, a separate power transfer device such as the Von Duprin - EPT2 or ABH-PT200 can be used.

Krieger offers the 705 SCIF Door and Lock Package to meet SCIF Sound Groups 3 and 4 standards, and comes installed with a Sargent & Greenleaf or Lockmasters locking device. Meets 705 standards and locking devices meet the federal specification FF-L-2890C.

Krieger offers the option to add radio frequency (RF) 40 dB protection, allowing the 705 SCIF Door and Lock Package to be used in RF areas as well as TEMPEST facilities.

The complete package includes a door panel, frame, hinges, closer, locking device, threshold, door bottom, and seal system. Learn More