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1) If the alarm is 15 years old, it should have been replaced 5 years ago. All smoke alarms should be replaced every 10 years and all carbon monoxide alarms should be replaced every 5 years. All manufacturers have this time replacement recommendation. A smoke and/or carbon is working 7 x 24 x 365 whether or not smoke and/or CO is in the surrounding area. I recommend to replace the chirping alarm with a new one since the alarm is more than 10 years old.
If you do not wish to replace the chirping detector, let me know as there are many possibilities that a smoke detector can go into a chirp mode...........Thanks...........Kevin!
2) Check out Firex's home page link: The following recommendation is highlighted on the left hand side of their home page. Click on the link to read more info.
Replace & Upgrade Today
Have you ever replaced your smoke alarms? If your alarms are 10+ years old, it's time to get new ones. Learn more about replacing and upgrading your alarms and the batteries
3) The International Building Code recommends inter-communicated smoke alarms be located in every bedroom or sleeping area of the home, 1 in the basement and 1 installed in each hallway. Carbon Monoxide alarms are recommended outside of the bedrooms (hallway area) and 1 in the basement. Many manufacturers sell combo smoke and CO alarms. Batteries should be changed twice per year. Wireless inter-communicated alarms are also available and do not need to be hard-wired if installing in a new location that does not have readily available electrical wiring.
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