If a detector is specifically listed for door frame mounting, what type of detector is it?

If a detector is specifically listed for door frame mounting, what type of detector is it?

• A. A detector mounted on a ceiling
• B. A detector mounted on a wall
• C. A detector mounted on a floor
• D. A detector that is mounted on a door frame

Answer: (D)

Mounting placement and how a detector is listed for that placement matter because the sensing element and airflow path are validated for that exact location. If a detector is specifically listed for door frame mounting, it is designed to be installed on a door frame rather than on the ceiling, wall, or floor. This placement ensures the sensor is positioned to detect smoke or heat entering through the doorway, while using the hardware and mounting method rated for that surface. The listing confirms performance and reliability for that installation spot, which is why door frame mounting is the correct description.

Mounting placement and how a detector is listed for that placement matter because the sensing element and airflow path are validated for that exact location. If a detector is specifically listed for door frame mounting, it is designed to be installed on a door frame rather than on the ceiling, wall, or floor. This placement ensures the sensor is positioned to detect smoke or heat entering through the doorway, while using the hardware and mounting method rated for that surface. The listing confirms performance and reliability for that installation spot, which is why door frame mounting is the correct description.