what does positive latching mean

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The Von Duprin Guard-X exit device is not fire rated because the deadbolt is not spring loaded. Therefore, there would be no positive latching as required on a fire rated opening. 
Panic Hardware and Fire Exit Hardware are two different types of exit devices, and the proper selection is determined by code requirements. Panic Hardware is an exit device which is tested for u...
The most obvious difference (in the device) is the lack of mechanical dogging on a Fire Rated Device.  There are some internal parts that may be different and the method it is secured to the d...
Power Boost is a positive latching feature that increases the latch force, to over come building stack pressure or door weather stripping, etc, if the door stops before coming completely closed. T...
The wires on 6000 series electric strike solenoid are non polarized.
Number of reasons could Von Duprin 55 or 88 series cross bar to sag. Attached are the reasons that could cause the cross bar to sag or not lift. The hinge case spring lifts both lever arms and t...
9857-F Series, 9957-F Series
9857, 9957
 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...