overhead stop on STC

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STC stands for Sound Transmission Class. An STC (Sound Transmission Class) is a single number rating system derived from measured values of sound transmission loss in accordance with ASTM E90 and...
 Cam Lift Hinges are specially designed hinges used mainly on acoustical door assemblies. The Cam Lift Hinge lifts the door during its travel and seats the door bottom for a pos...
Steelcraft have tested different types of doors and frame assemblies using Zero International gasket seals for the various STC ratings. Tests are in accordance to ASTM...
Frames can be installed either KD (knock down) or welded to receive the STC rating.
Steelcraft borrowed light frames are not listed/tested. Check with the glass manufacture if they are listed and with what type of framing used.
Sound seals are required. Zero International Gasket Notes: Perimeter Seals – Zero #475 applies to the stop of the head and jambs. Door bottom – Zero #367, surface applied. Threshold ...
A special template is not needed, the closer drops down far enough on the door where it does not conflict with the GJ100 series concealed overhead stop. 
We may have current comparable models.  Unfortunately they are not drop in replacements.  The application will need reviewed to determine which overhead stop can be used.  Please con...
A 4040-18G drop plate will be needed to drop the closer and arm down far enough not to conflict with the GJ 90 series overhead stop.
The LCN 4041/4040XP and the Glynn Johnson 90 series can be mounted in conjunction with each other without a special template.  The 4040 door closer is on the pull side of the door and the GJ 90 is ...