Ventless gas-log question(s)

Previous owner claims 2 gas-log units in the house are 'ventless'. I can't find a manu. name/part no./mode no./ on these darn things and am hoping to at least verify they are indeed ventless.
I've been told that the very light thin-ceramic-over-fiberglass logs are a sign of a 'ventless' unit. Any other thoughts?
Has anyone ever seen a ventless unit installed into a woodstove?
I've heard ventless units have a CO2 detector built-in. Is this true? If true, when did they start doing this?
Also, has anyone ever been able to find replacement logs? Some in my unit are cracked/broken.
And last, a rant: how can a gas-log unit not have a manufacturer's name clearly stated on it? Maybe if I disconnect the gas line and look under the thing...
Dave
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The list of manufactures that do not label their products is long and growing. I have never seen a ventless set of logs with a CO detector.
To many variables, seek local professional help.
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===They have an oxygen depletion sensor. You should ask your gas supplier to perform a service check. ===
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