The NFPA has a "standard" for CO detectors, which is essentially useless. The standard says "follow manufacturers' instructions.' Keep your $25.
Thats exactly right. Its the NFPA 720, and it doesn't say much. There were proposals made to get tehse into the IRC for 2003, but such were shot sown due to having no good standard to reference (720). I agree with John, these should not be required.
