Hollow Metal Doors & Frames, Architectural Hardware
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Security: Guards
 


The weakest point of every building is its doors and every owner has to be concerned with protecting their doors against forced entry, specifically by protecting the point of attack which is the door latching mechanism. To that purpose, manufacturers have created a number of different guards which are summarized here. Most are available in a paint finish or stainless steel. In addition a number of other devices are used to protect the door overall.


NRP Hinges: Hinges on outswing doors can be attacked by removing the pins unless the manufacturer has grooved the barrel of the hinge and inserted a set screw to prevent it from being lifted. Alternately manufacturers have also manufactured hinges with internal studs on one leaf with corresponding recesses on the opposite leaf to receive them when closed. Retrofit pins are also available which when inserted in place of a hinge screw will fit into the screw hole vacated on the opposite leaf.

 

Latch Guards:  These are heavy steel plates with studs for inserting and fastening into the door leaf that extend over the door jamb to protect the gap between the door and the strike.  Most are bent up in the centre to accommodate projecting electric strikes. Often they also have a curved notch on the back edge to fit snugly against the lock rose. Longer versions are used to protect both the latch and a deadbolt above.

 

Latch guards for aluminum doors often incorporate a hole with a raised trim ring to fit around the door cylinder. These prevent a vice grip attack on the cylinder whereby the intruder tries to forcibly turn the cylinder to break off the internal set screw that holds it in the deadlock  and then remove it to get at the internal latching mechanism. 

 

Astragals: Double doors are vulnerable to pry bar attacks where both doors are active and there is no mullion between or behind them especially where the doors are misaligned.Double doors with one leaf active and the other inactive are also vulnerable.Z astragals help to reduce the gap between the doors but do not eliminate it. One option is to weld a flat bar to the face of the active leaf. Another option is to install a long stainless steel or primed steel strip of metal onto the active leaf using non removable screws.

 

In their desire to protect their premises, some owners have installed surface bolts on the back sides of doors with bolts projecting into the jambs, or brackets, on the doors to hold wood and steel bars that straddle the door openings and replaced locksets with double cylinder deadbolts. NOTE: if these doors are designated fire exits, these actions are dangerous and illegal. The fire code (NFPA 80) requires that all doors through fire exits must be easily exited with one motion of the hand.



Thank you for your quick reply yesterday! Congratulations on your move to a newer facility, hope everything is going well!


Michelle