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How-to-tell-the-difference-between-vented-and-vent-free-gas-logs, the difference between vented and ventless gas logs. vented and ventless gas logs are a little different. vented gas logs burn like a real wood fire with a yellow flame that produces smoke. they must be burned in a wood burning fireplace with the damper open, so smoke goes up the flue along with most of the heat.. Inspect the logs. all vent-free logs are firmly attached to a u-shaped burner and cannot be moved. if the concrete logs are loose, the logs are designed for vented use. follow the gas line from beneath the logs to where it disappears in the wall or floor. if the gas is merely contained by a simple gas line, then the logs are vent free. if there ...