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Resolution: 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...:

What is a U-Factor?

Resolution: The U-Factor, R-Value and K-Thermal Rating are measurements of thermal transmission through building products. U-Factor: Overall co-efficient of heat transmission passage through a built-up panel...:

What is an STC rating?

Resolution: 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...:

GF3000 coil does not float

Resolution: Current production GF3000 have a fixed , solid coil. Previous models excluding the BRD had spring load floating coils. This allowed the coil to drop and meet the armature, Engineering is reviewing ...:

Which keyed removable kit is used with a 4754, 4854, 9854, or 9954 mullion?

Resolution: The Von Duprin 4754, 4854, 9954, and 9854 mullions can be converted or ordered with key removable option. KR54-F kit is the conversion kit to convert the above mullions to key removable mullion.: