7 ms·
There's a physical product that implements the same idea [1]. I'm not sure how it actually works (presumably there's a patent somewhere, is there an alternative
by bearbin 2y ago
There's a physical product that implements the same idea [1]. I'm not sure how it actually works (presumably there's a patent somewhere, is there an alternative solution?) but it's quite a magic feeling to hear the fire alarm go off and the doors independently close by themselves. If you're in a building that uses these, you can test yourself by playing a recorded fire alarm sound - they work on quite a few different ones (and it really doesn't have to be that loud!). They also have a surprisingly long battery life, ~10 years I think so the detection mustn't take much power at all.
[1]: https://www.fireco.uk/products/sound-activated/dorgard/ https://www.fireco.uk/products/sound-activated/dorgard/
- paranoidrobot 2y agoUbiquiti also has a battery powered alarm-sound sensor in their Unifi Protect lineup[1] > "Based on UL217 and UL2034 alarm patterns." UL217 is apparently for smoke alarms, UL2034 is apparently for CO alarms. https://store.ui.com/us/en/collections/unifi-camera-security-special-sensor https://store.ui.com/us/en/collections/unifi-camera-security...
- msla 2y ago> it's quite a magic feeling to hear the fire alarm go off and the doors independently close by themselves Closing doors on a fire alarm seems hilariously cruel.
- c22 2y agoIt prevents the fire from quickly moving through the building...
- msla 2y agoAlso, people.
- deleted 2y ago[deleted]
- zamadatix 2y agoYeah, that's a given, but the point of fire doors is to maximize overall survivability instead of the "average doors crossed per minute" stat in isolation.
- withinboredom 2y agoThe doors don't lock, they just close.
- flyinghamster 2y agoIn many large buildings (schools, etc. in particular), you want the internal fire doors to close to keep the fire from spreading. Of course, exits must be provided for each isolated section.
- chedabob 2y agoThese are installed on doors that have an auto-closer anyway. They deter people from propping them open permanently with a wedge or a chair.
- treflop 2y agoYou can also enable fire alarm audio detection on iPhones, HomePods and other home smart hubs.