All content copyright Tom Rubenoff 2010-2021
Definition Basically: Fail Safe = power off, it’s unlocked Fail Secure = power off, it’s locked Electric locking devices include: Electric strikes Electromagnetic locks Electromechanical locks Electrified exit devices Most electric strikes are sold fail secure by default. For example, if you order a Von Duprin 6123 24V US32D, and architectural grade 1 electric strike, … Continue reading “Fail Safe and Fail Secure Electric Locking Devices”
Wireless access control locks are at the leading edge of door hardware evolution, creating hybrid devices that are both credential reader and locking hardware all in one. Some of these locks are designed to integrate with existing access control systems without the need to run cable back to the panel from the door; others interface … Continue reading “The Wacky World of Wireless Access Control Locks”
The Precision E2203 is a Surface Vertical Rod exit device with a solenoid in the head that controls the outside lever trim. Ordered complete with trim: part number is E2203 × 4908A, specify door width, finish, handing, fail safe or fail secure. The right thing to do is to order it fail safe or fail … Continue reading “Field Reversing the Precision E2203 SVR Exit Device”
When specifying door hardware I understand that it can be like being an kid in a candy store. But like that kid, you may not be able to always get everything you want. Sometimes “this” might not go with “that.” There are some examples that should be obvious, such as fire rated exit devices with … Continue reading “Compatibility Issues”
Von Duprin offers several versions of its QEL (Quiet Electric Latch retraction) conversion kits for its 33, 35, 98 and 99 series exit devices. The variations are: Modular (no baseplate) Modular, with connectors (Molex) Modular with hex dogging Modular with hex dogging and connectors With baseplate, specify 3-ft. or 4-ft. With 3- or 4-ft. baseplate … Continue reading “Von Duprin QEL Kit Diversity”
I have mentioned this before, but it bears revisiting. Lock problems and door problems are often related. If the door is does not swing or is not hung properly the lock may not work properly either. I bring this up now because I was recently called upon to go out and do actual work. I … Continue reading “Door Sag”
Last year Von Duprin began shipping Chexit self-contained delayed egress exit devices that are motorized instead of solenoid driven. Since they are motorized, the new Chexits draw less current and will probably be more reliable than the previous solenoid-driven version. This means a less serious, less expensive power supply, less need for high capacity, high … Continue reading “Experiencing the New Von Duprin Chexit”
Delayed egress is a process that delays unauthorized exit from a space while complying with NFPA 101 life safety code. Use of this process is strictly regulated with the help of building inspectors and fire marshals across the United Sates. With that in mind it is always a good idea to get your local AHJ … Continue reading “Choosing a Delayed Egress System: Self-Contained, or Built from Components?”
The Medical Metaphor As previously published in Doors and Hardware Magazine, Feb. 2016 As in the medical profession, correct diagnosis of door hardware problems is wholly dependent upon the knowledge, skill and powers of observation of the person whose job it is to correct the problem. “The devil is in the details,” they say, and … Continue reading “Door Hardware Triage”
Positive Pressure Issues Sometimes doors are required to perform conflicting functions simultaneously. For example, in order to comply with the American Disabilities Act a particular door may be restricted to a door closer that requires as little as five pounds of opening force. This same door may be required to lock automatically without fail. One … Continue reading “The Pressure’s On”