How To Look At A House
McGarry and Madsen's home inspection blog for buyers of
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How can I tell the difference between a smoke detector and carbon monoxide (CO) detector?
Tuesday, July 30, 2019
Here’s a few pointers to help you determine whether you have a smoke alarm or carbon monoxide ((CO) alarm, and maybe without having to unmount it:
1) Hard-wired smoke alarms are usually found in hallways and/or bedrooms, on or near the ceiling, and they often have no visible designation on the face or it is faintly embossed in the plastic. Battery-powered smoke detectors can found installed anywhere around the home by a homeowner, including garage, kitchen, and even the attic.
2) CO alarms are currently required to be in the hallway or access area to each bedroom although, again, you might find one anywhere around the house. They are more likely to be clearly marked on the face as carbon monoxide. Where you find two detectors mounted side-by-side, one is likely to be a CO detector. Then again, sometimes one of them is a long-dead smoke detector left in place.
3) Any detector device plugged into a low wall receptacle will be carbon monoxide. They are usually a rectangular shape.
4) Most builders comply with the requirement for both a CO and smoke detector in the hallway or access room to bedrooms of new new homes, which has been enfored since 2008 in Florida, by installing a combination CO and smoke detector at the double-requirement locations. They are usually clearly marked, but can also be verified by pushing the test button and hearing both a “WARNING CARBON MONOXIDE!” and “WARNING FIRE!” voice recording on many models.
5) If still undetermined, remove the smoke detector and examine the back. On most, but not all, smoke detectors you will also an find the date of manufacture stamped in small letters. Smoke detectors older than 10-years have exceeded the manufacturer’s rated lifespan and should be replaced.
6) Never assume that the all the smoke detectors are hard-wired with a battery backup because it is a newer house. The homeowner may have replaced some or all of them with battery-powered detectors mounted over the hard-wire box. If this is a concern, remove one or two of them at random and examine the back.
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