Building safety relies heavily on small components that most people overlook on a daily basis. One of the most critical elements of any commercial or residential building is the fire door lock. When a severe emergency strikes, standard hardware easily melts, warps, or fails under extreme heat.

Choosing the right hardware for your doors is about more than just style. Security, function, and fit are all crucial elements, and getting the measurements right is fundamental. When it comes to installing a mortise door lock, one of the most important measurements to understand is the "backset." Getting this wrong can lead to installation headaches, an improperly functioning door, or even the need to replace the door itself.