Fast Code 3 smoke alarms?

[Firealarm251]

Video in question: https://www.youtube.com/watch?v=5VGGLT0cNfo

At around 0:40-1:00 you can hear (what I believe are smoke alarms) doing a very rapid code 3. My question is, what brand/model does code 3 that fast?

[Fire_Alarm_Fan]

They were probably saved from “death”. Sometimes as a smoke alarm is exposed to extreme heat the chips/circuitry will change in a way where the T3’s speed will increase. Also the pitch of the horn will often lower by a half step. (Ex: If the horn’s pitch is normally G, the heat will cause it to become G♭/F♯.

Or they might be wet from the fire hoses, water will also affect the circuitry.

[cl94]

@Fire Alarm Fan

They were probably saved from “death”. Sometimes as a smoke alarm is exposed to extreme heat the chips/circuitry will change in a way where the T3’s speed will increase. Also the pitch of the horn will often lower by a half step. (Ex: If the horn’s pitch is normally G, the heat will cause it to become G♭/F♯.

Or they might be wet from the fire hoses, water will also affect the circuitry.

Some Kidde smokes do a fast code 3. My parents’ house has interconnected Kidde smokes that do rapid code 3 when set off.