If someone were to hiccup, and you hit them with a fire hydrant unconsious would they still be hicupping?
Google Jay Shuttleworth contact him. But be prepared to wait drop a bunch of $$$ ETA: To elaborate, several weeks aprox $200 +/-
In the US 900 sq ft is regarded as a starting point for design. Other considerations include air velocity, ceiling height, distance between detectors, distance between detectors and walls, hazard to be protected and value of protected objects.
I did a quick look up and I found that most smoke alarms have 85db at 10 feet. Since you say that you have hearing pain then you very well may have slightly damaged your ears. Im sure even if did damage your hearing it would be so small it would be undetectable. And yes, plugging your ears or stopping the sound from entering your ear canal will decrease the db / damage to your hearing. Good luck friend, I hope it is just a minor temporary thing with your ears, nothing to serious I hope.
