Where should a smoke detector be mounted to provide a 2-hour fire rating directly from the door it releases?

Mounting a smoke detector as close as possible to the door being released is crucial for ensuring that it can effectively detect smoke that may enter the area during a fire. The primary function of the smoke detector is to provide prompt warning of smoke and fire, which is vital in a life-safety scenario. When situated near the door, the detector can quickly sense smoke produced by flames or heat emanating from a fire that might be occurring on the other side of the door.

This placement allows for a faster response from the fire alarm system, enabling it to alert occupants of the danger and providing them with the critical time needed to take action, whether it's evacuating the premises or initiating a fire response. Additionally, being close to the door can help ensure that the detector is within the flow of smoke, which will naturally rise and travel toward the ceiling, enhancing the likelihood that the smoke reaches the detector quickly.

A smoke detector positioned on the wall opposite the door may not be as effective, as it could take longer for smoke to travel across the space, delaying alarm activation. Similarly, mounting it near the ceiling above the door could hinder its ability to detect smoke accurately if it originates from elsewhere, as smoke may stratify or not rise directly to that height immediately