carbon monoxide detector

Proper placement of carbon monoxide (CO) detectors is just as important as having them in your home. Unlike smoke detectors, CO detectors have specific placement requirements to ensure they can effectively detect this deadly, odorless gas.

Key Fact: Carbon monoxide mixes evenly with air, so CO detectors should be placed at breathing height – typically about 5 feet from the floor. This differs from smoke detectors which are usually placed on ceilings.

Optimal Locations for CO Detectors

Follow these placement guidelines for maximum protection:

  • On every level of your home – Including basement and attic if they’re finished spaces
  • Near sleeping areas – Within 10-15 feet of bedroom doors to wake sleeping occupants
  • Near attached garages – CO from vehicles can seep into living spaces
  • Near fuel-burning appliances – Such as furnaces, water heaters, and fireplaces (but not too close – see below)

✔ Good Locations

  • Hallways outside bedrooms
  • Living rooms on each floor
  • Near, but not directly beside, fuel-burning appliances
  • At the top of basement stairs
  • In rooms above attached garages

✖ Avoid These Locations

  • Directly above fuel-burning appliances
  • In humid areas like bathrooms
  • Behind furniture or curtains
  • In direct sunlight
  • Near windows or ventilation openings
  • In unheated spaces (like unfinished attics)

Special Placement Considerations

Distance from Appliances

Place CO detectors at least 15-20 feet away from fuel-burning appliances to prevent false alarms from normal startup emissions. However, they should still be on the same floor as major appliances.

Multi-Story Homes

In multi-level homes, place detectors on each floor including the basement. The detector near sleeping areas is most critical since CO poisoning often occurs at night when people are asleep.

Mobile Homes

For mobile homes, place detectors near the entrance to each sleeping area. Due to compact spaces, one detector may suffice for small units.

How Many CO Detectors Do You Need?

The National Fire Protection Association (NFPA) recommends:

  • Minimum: One detector on each habitable level (including basement)
  • Ideal: Additional detectors within 10-15 feet of each bedroom
  • Large homes: May need multiple detectors per floor depending on square footage

Remember: CO detectors are not substitutes for smoke detectors. You should have both types of detectors properly installed throughout your home.

Installation Tips

  • Mount on walls at breathing height (about 5 feet up)
  • Can be placed on ceilings if manufacturer recommends (but no more than 1 foot from ceiling)
  • Follow manufacturer’s specific instructions for your model
  • Don’t place in dead air spaces (like corners where walls and ceiling meet)
  • Ensure detectors aren’t blocked by furniture or drapes

Maintenance Matters Too

Proper placement is only part of CO safety. Remember to:

  • Test detectors monthly
  • Replace batteries annually (unless hardwired with battery backup)
  • Replace units every 5-7 years (check manufacturer’s recommendation)
  • Vacuum detectors regularly to prevent dust buildup