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Question:

Why do some fire alarms have more than one direction to activate it?

There was a fire alarm where you had to break the glass push in the button and pull the handle down. Is there a reason why this would be like this? Have you ever seen a fire alarm with more than two directions? If so what were they? Would it take longer to break the glass push in the button and pull down? Would a person in a fire feel stressed since they had to break the glass as well?

Answer:

Dude, Fire alarms like First Alert SA720CN use photoelectric sensor. Its job is to detect the smoke and alert you, and not to suck it out. Apparently, the sensor won't be effective with large amount of smoke flooding through its way. And you won't want to be biting your nails till the whole smoke is sucked out through a few small holes. Simply open the windows, folk!
If a child is addicted to video games, the best thing to do is to start by getting him a portable system that he can take with him. That will at least get him outside. Then you can start slowly weening him off of the games by asking him to go to an amusement park in which he cant play the games the whole time I guess in short just try to give him a fun time and show him that video games are not all there is in life (this ocming from a video game art design major)
The idea is not without merit but there are a few things you need to consider and possibly work out. 1. When you try to draw smoke out of a room, you have to create an air flow with clean air coming in to replace and to push the smoky air out. If the room is sealed with minimal air inlets, you do not have sufficient flow to do much of a good job removing the smoke. 2. If you DO have good air flow into the room, you can set up a draft which could (depending on the location of the fire) draw the fire to the room sooner. And again with the air having to come from somewhere to force the bad air out, an influx of clean and oxygenated air could help the fire more than the person(s) trying to escape it. 3. The obvious answer is to create zones where the air is coming from outside and only into the area that it is needed. However such access to the outside is a path of escape for heat in the winter making it harder to heat the house properly. 4. Any ventilation system requires power to the fans. Power that may be disrupted in the event of a fire. Batteries may be the answer, but you have to make sure that there is enough battery life to do enough of a job to get people out of there. These are what you have to overcome in order to come up with a feasible prototype. Good luck!

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