I have a respironics Everflo Q OPI. During use,around 4AM, it sets off a single smoke alarm in the ceiling. I turned it off. The room had a smell in the air

Question edited for a lot more clarity.
Question moved from Television and Video category.

It can be two things.
It went over pressure and is venting.
or
It has a dry bearing.

If you don't mind changing batteries every 6-12 months during the year then you can pick up these smoke alarms from any hardware or even discount store. The also come in blister packs (2 to 6 or more for value packs) Most will screw mount to attach to wall. You can also use self stick foam tape to 'stick it' anywhere. Try to put them in a high spot on wall or ceiling depending on the surface (crumbly textured surface won't stick well. It will have to be mounted with a screw) The higher locations will give you quicker response time but It's harder to get at without a step ladder. Lower units have slower response time as the smoke has to collect and lower to the point where the alarm is.
*** Note; you will need to check your fire code requirements for placement of alarms. (though once this minimal requirement is met there is no reason you can't add more in other locations for added coverage; like a large walk in closet, baby's room, laundry room, etc.)
* Getting back to your question, I'm guessing you have the updated required powered alarms or need to have a "Powered" fire alarm. The newer homes (well last 20 years is new to me) have low voltage power lines running from room to room where the alarms are placed. If you required to install this type of system then depending on the ceiling access (crawl space, lowered ceiling, etc.) and the need to run the wires "hidden" behind wall and ceiling will increase the installation time and labor costs. Electrician or authorized fire alarm technician will be needed. They should check your fire alarm requirements for you local, indicate locations for alarms, run wires, install and test. Check with several companies in your area and get several quotes. Check with Better Business Bureau for rating or complaints.
* With Smart ware being all the rage. It may be possible to use these "smart devices" to alert you to other situations besides just fire hazards. Break in, baby monitor, door ringer monitor, water (flooding), Carbon Monoxide, etc. But the alarm guy should be able to give you more options. Though I's still up to you how much you want to spend.
* Final; You check what the fire codes require. If they called you first then suspect a scam or a sales pitch to get you to buy something you don't require. You can always go with the 'stick on' alarms if that is allowed for your area. Call the fire Dept in your area. Those are the 'good guys' that want to keep you safe.
Aloha, ukeboy57

The filter may need servicing or the power supply has a malfunction.

This is not something that you can do. The settings are only accessable by the clinic that issued you the machine.

http://www.kidde.com/Documents/User-Guide-900-0102-A-ENG.pdf Remember that smoke take presidence over C/O detection so notice whats going off first . LED Indicator Operation
Red LED
The red LED will flash as described below under the following
conditions:
--During smoke or CO alarm, with every beep
--During testing (same as alarm)
--Low battery, single flash with chirp
--End of product life, double flash every 30 seconds with chirp
--Unit error mode, single flash with chirp
--Unit error mode, a Fault Code is flashed every 30 seconds (can
be observed and reported to customer service for
troubleshooting. Above is the user guide.

This fan company will warranty to 5 years. Sorry.

sometimes the alarms are ganged to other apartments .. that's so if there is a fire in one apartment then others are alerted as well .. so the low battery warning could be from a neighbor ... also there may be a common ceiling space that will allow you to hear your neighbors detector .. at any rate someone around you has a low battery in their detector .. if they are ganged then that may be an apartment management maintenance item ..

Couple things I would look for first the condition of the blade do you see any buildup around the teeth like something has burnt on it. Also look into the area around the blade under the table (unplug saw first) to make sure that something hasn't dropped into it rubbing blade causing smoke. Also turn the blade by hand to make sure turning freely. The smoke could possibly be coming from a bearing. If it less than a year old Bosch has a pretty good warranty and you might look into that also. Let me know and I will dig deeper into it.

I haven't had any problems with my Vicks Cool Mist Humidifier other than the fact that the area surrounding it is slightly wet after operating for a couple of hours....While I understand that I was using this to moisturize the air during a cold, I knew this would happen, because the air in my room is not dry. If the room isn't dry, the mist that it's putting out in to the air has no where to go but surround the humidifier. All I did to stop this was to buy a water proof mat. I suggest you do the same -- Also, in regards to the water smelling -- You should be cleaning out and drying the basin after every use. Water shouldn't smell unless you let it stagnate inside the plastic -- Try running distilled vinegar through the machine for a couple of minutes -- Also, I would use an extension cord and let it run outside so that your house doesnt smell like Vinegar.