Second, I replaced all my hardwired smoke detectors with battery-powered models with 10-year batteries, all in an effort to cut down on 3AM false alarms.
Nope. They're still registering false alarms monthly, at all hours, and these permanent-battery models will not shut off! There's no silencing them.
ours was replaced after the smoke alarm failed to go off at the start of august after the chimney fire. The RFS (rural fire service) actually asked us if we had a smoke alarm - which we had. I even took him to it and got them to press the test button which went off. sadly, as I said the alarm had not sounded despite my asthma playing hell and there being a very definite smoke smell...
About a week after the chimney fire, in the middle of the night (not joking, it was 2am) the alarm sounded. Full on fire, not the battery is flat, but full on fire... now given that we couldn't use the stove and were relying on electric fires and our Dyson hot & cool fan to stay warm, I wasn't impressed. It was duely ripped off the ceiling, screws and all and all batteries removed (this was a fire alarm that came with our tenancy and was serviced and tested annually and had been tested the previous April). We had always found it odd that even burning toast never set it off.... so we asked our landlord for a new one. They are surprisingly expensive...
The new one is one of these 10 year battery models (in fact we now have 3 of them). And yes, even the airfryer sets it off despite it being in the hallway. But it has a 10 minute silence mode (and no it doesn't stay silent for 10 minutes either! we get about 5 minutes peace from it as we found out last night when hubby added oil to the airfryer for the chips... and it smoked rather badly (I suspect he used the olive oil again rather than canola or sunflower oil...).
I had one go off at 2AM in a hotel room once. I had to stand on the bed, remove it, and put it in the trunk (boot) of my rental car for the night.
I have also had the fire alarm go off in a hotel once (roughly 3am) and it was the middle of a bitterly cold Welsh winter. The owners of the hotel having emptied everyone from their rooms, however, kept us all in the lobby because they also couldn't locate a fire. (It later turned out to be CO rather than a fire).
But you also reminded me of the time my ex-step-father came creeping up the stairs to the 2nd floor (UK naming here, so ground, 1st then 2nd) and crept into my room shinning a torch around. I had heard him coming up the stairs (I'm an exceptionally light sleeper and even a vehicle driving passed our home here in Australia will wake me at night because it is such an unusual occurrence). Anyhow, I had to ask him what he was looking for. the reply was the fire... why? well the fire alarm was bleeping... It was, but only 1 short beep every 3 minutes. He had assumed that meant there was a fire and in the middle of yet another very cold night, had been creeping around the house with a torch looking for a fire. I being a typical teenage girl with very little respect for him anyway, retorted that 1) the fire alarm wasn't going off - no way would that wake the entire house, 2) he'd smell the smoke, and 3) as just an after thought, that perhaps fire meant light and he wouldn't need the torch.... he left. Guess he never actually read the smoke alarm instructions when he bought them and asked me to install them! (this was back in the 80's when they were a new concept).
You also remind me of the number of times the chemistry labs had to be evacuated when I was a PhD student.... it got that bad that having evacuated us on another bitterly cold sub zero morning in the south of England, we were standing out in T shirts and a lab coat... no house keys for those who lived locally (not me), no coats, no food, no money, no medication.... and the list went on. Several students ended up in hospital for mild hypothermia and I ended up at the site's medical facility trying to obtain an emergency inhaler. After that incident, the fire brigade actually recommended that I always get my bag before leaving the building rather than evacuating directly (especially if there was no obvious smell of smoke) because my need for my asthma medication was actually more significant than the need to get out immediately when there was no obvious cause for the alarm (there were only 2 real alarms and once of those was actually raised by me when one waste organic bottles called a Winchester, exploded in the room I was in at the time. It had been boxed, along with 3 others, and the contents were written on the outside where they had been declared by the students so I knew that the contents of the box that went were not good or safe, but I figured this time around that given I was in the room when the incident occurred, and knowing that it was going to be many hours before we were allowed back into the building, I went via my room and then my locker and got all my belongings out. I also told students around me that this one was for real and they also should take their stuff with them so they could go home... only 2 listened. That time around it was the volatile nature of the waste products that was the problem because it was a gloriously sunny day in the middle of summer, in a room that was a wall of glass on the south side and these bottles had been sealed shut ready for collection later that day. (usually these bottles lived on lab benches to be filled as waste liquid was created - there was a system to what went in what bottle, but the key element was that the bottle never ever had a lid on it so that it couldn't build up pressure inside and explode...