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Start with what was installed
A gas log set places a burner and decorative media in a suitable fireplace under the instructions for that set. An insert is an appliance installed into an existing fireplace opening. A built-in gas fireplace is its own unit set into the structure. A faux-brick interior can be a manufactured panel, so brick visible through the front is a weak clue to the installation history.
Read a model name in context
A folder can contain both an original wood-burning fireplace manual and the later gas appliance’s paperwork. Look at the invoice description, installation date, fuel designation and the exact model numbers. An invoice for a “front” or “surround” may identify a decorative accessory, not the unit behind it. Keep both records, and tie each to its room and date.
Give the person booking the visit a clear description
For example, say “the paperwork lists a gas insert installed in an earlier fireplace, and the original manual is also here.” If all you have is a photo, say so. Take a room-side view of the whole opening without removing the front or reaching into the firebox. Let the technician identify the installed assembly before you commit to a part or a fuel change.