The 90's Called - They Want Their Fire Alarms Back |

Here's a video talking a little bit about how the Americans with Disabilities Act of 1990 (ADA) changed the fire alarm industry, and demonstrating various fire alarm signals from the early post-ADA era.

0:00 - Fire Alarms & The ADA
0:30 - Simplex 2903-9101 + 2901-9838
0:50 - Simplex 4903-9219
1:21 - Space Age V-33
1:45 - Space Age VA3
2:13 - Edwards Integrity
2:43 - System Sensor MASS - Overview
3:04 - MASS - Slow Whoop
3:24 - MASS - 800 Hz Continuous
3:41 - MASS - 800/1000 Hz Alternating
4:01 - MASS - 2400 Hz Interrupted
4:13 - MASS - 2400 Hz Continuous
4:32 - MASS - 1200 Hz Interrupted
4:45 - MASS - Swept Frequency
5:00 - MASS - Fast Warble
5:18 - Bonus Clip
5:40 - Conclusion

Sources:
https://www.ecmag.com/section/systems...