Krieger perimeter seals are 1-1/8" high. The latest oversize roses for lever trim (with spring assembly) will overlap Krieger perimeter seals at 2-3/4" backset; and, if a knob is used, there is very little grasping clearance. Krieger recommends you use a 3-3/4" backset for either levers or knobs on custom doors.
Mortise locks are only available with a 2-3/4" backset so we recommend using lever handles instead of knobs to insure proper clearance. Rose 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 an acoustical rating of soundproof doors with this type of lock.
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 latch bolt with at 3-3/4" backset. As an alternative, consider using the Yale eBOSS E5400LN, Alarm lock Trilogy DL 2500 series digital cylindrical lock with a 3-3/4" backset, or Schlage "AD" pushbutton lock.
The combination of dual seals, 2-1/4" 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, or a 5" backset Mortise Lock series 9100 by Accurate Lock or consulting Krieger before making your final selection.
We suggest using an electric lock in lieu of an electric strike. Electric locks permit seals to be adjusted properly which substantially reduces the risk of compromising the sound rating of the opening.
Most electric strikes are too sensitive and bind up when used with "compression" type seals and for that reason we do not recommend they be used together.
Compression seals create pressure between the lock latch bolt and the gate of electric strike which will not allow the gate to activate and retract. If electric strikes must be used then magnetic seals should be utilized. Electric locks for soundproof doors and other custom doors require low voltage power be routed through the door. At conventionally hinged (level swing) openings this transfer is best done with an electrified hinge. For soundproof doors with Cam lift hinges, a separate power transfer devise such as the Von Duprin - EPT2, or ABH-PT200 is required.
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.
Some electric strikes for pairs of custom doors (such as the Von Duprin - 6220 Series) require a cutout through the door. We do not recommend these types of strikes because of the cutout and they will not work with the overlapping astragals.
Feel free to contact
our engineering team to review electrified locks being considered to ensure their compatibility with perimeter seals, proper operation and noise reduction requirements.