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Do you see a different number like CGL250TE or similar.This appears it may be serial number.
That is it. Give me a few moments to do some research on this.
Many of these units are convertible, but it does not appear that your fireplace is convertible.There are no parts numbers listed for a conversion kit and al references imply for natural gas you would need the CGN300TQ .
I am sure this is not what you wanted to hear, but I can only report what I find.
Yes, I hat having to give news that I know is not what customers want to hear, but it appears the unit did not offer a conversion kit