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And would it be a good idea to add a plug-in carbon monoxide detector/alarm in this closet?

Thank you - makes perfect sense. Had a feeling that might be the case. Now, a related question - this is a 40 y/o house whose maintenance was apparently often deferred. So I looked up inside the one on the left (A) with a flashlight, and it's not blocked by debris - all looks good for...

I want to remove these two metal things, but I'm not sure what they are or if they serve an important purpose. These things are located in a 10x8 or so water heater closet at the end of our 40-year-old house. The closet is accessed through its own exterior door, not through the house, and it...