Smoke detectors are required in every bedroom, outside each sleeping area, and on every level. CO detectors are needed near bedrooms and fuel-burning appliances. Test monthly, replace batteries annually, and replace units every 10 years.
Placement
Smoke: every bedroom, hallway outside bedrooms, every level. CO: near bedrooms and appliances.
Types
Ionization for fast flames, photoelectric for smoldering fires. Combination units available.
Testing Schedule
Test monthly. Replace batteries annually (daylight saving time change is a good reminder).
Replacement
Replace entire unit every 10 years. Date of manufacture is printed on the unit.