Place it at the peak of a prank scene, after a smoke detector beep and before a fire alarm echo answers it, so the edit moves in stages toward the reveal and the second alarm closes the sequence.
About this sound
This is an 11-second powerful fire alarm, a loud piercing siren that repeats in sharp bursts and fills a room instantly. It feels urgent and startling, the kind of noise that makes people stop, look around and move at once, with a tense edge that keeps everyone on alert until it ends.