How close to heating/cooling system supply registers can fire alarm equipment be placed?

Fire alarm equipment is required to be installed at a safe distance from heating and cooling system supply registers to prevent potential interference with their operation and to avoid exposure to fluctuating temperatures that could affect the performance of the fire alarm system. The National Fire Alarm and Signaling Code (NFPA 72) specifies that such equipment should be positioned within a 36-inch horizontal path. This distance helps ensure that the functioning of the fire alarm system is not compromised by the airflow or temperature variations that can occur near supply registers. The guideline aims to maintain the integrity and reliability of fire alarm systems, allowing them to operate effectively in emergency situations.