Double doors are everywhere—office buildings, hospitals, schools, and hotels. They offer wide passage and a sense of grandeur. But there's a hidden component working behind the scenes to keep these doors functioning safely and effectively: the door coordinator.

Imagine a crowded theater or a bustling office building during an emergency alarm. The smoke is rising, panic is setting in, and hundreds of people rush toward the nearest exit. In this critical moment, the door they reach cannot be a puzzle to unlock. It must open instantly and effortlessly.

Fire doors are the silent guardians of our buildings. In the event of an emergency, their ability to self-close and securely latch can make the difference between a contained incident and a catastrophic loss. At the heart of this functionality lies a small but critical component: the latch bolt. Specifically, the "throw"—the distance the bolt extends into the strike plate—is a dimension that is rigorously regulated by safety standards.

Have you ever rushed out of a building, pressed a horizontal metal bar on the door, and watched it swing open effortlessly? That device is called a panic bar, or a crash bar, and it is a critical safety feature in modern architecture. While we often take them for granted, these devices save lives by preventing crowd crushing and ensuring rapid evacuation during emergencies.