I have a smoke alarm in the hallway right by my bedroom. And it is also right under the air vent of my central heating and air conditioning system unit. This actually causes a small problem that has become a large problem in recent times. It seems every single time that the central heating and air conditioning system goes on it sets off the smoke alarm! It does not matter if it is heating or if it is air conditioning. The smoke alarm will still go off from the force of the air that is going to be coming out of the air vent. I just recently unplugged the smoke alarm because of this. If I have a fire, I will be dead. But it is doubtful that will happen in the next few days. I have someone coming out to relocate the smoke alarm to another part of the house far away from any air vents of the central heating and air conditioning system unit. I will be happy once this is done because it has been quite a headache dealing with as of lately. It will be good to finally get the smoke alarm moved away from the air vents of the central heating and air conditioning system so I can sleep at night. I never knew these smoke alarms were this sensitive until the situation I experienced with the central heating and air conditioning system and its air force from the air vent hitting the smoke alarm.