Do vented gas logs require the chimney damper to stay open?
Yes — vented gas logs must burn with the damper fully open, because like a real wood fire most of their heat and all of their exhaust go up the chimney. Installers typically clamp the damper permanently open so it can't be closed by mistake. Vented logs are about the tall, realistic flame and ambiance — not efficient heat.
Why the damper stays open
Vented gas logs produce that big, lazy yellow flame by burning the way a wood fire does — and that flame throws off real combustion byproducts that have to leave up the flue. Close the damper and you'd trap exhaust in the room, so it stays fully open every time the logs are lit.
To make that foolproof, we clamp the damper permanently open during installation, so no one can accidentally close it and spill combustion products into the living space. A set like the Real Fyre Charred American Oak is built to be seen through an open flue.
Ambiance, not a heater
Because the damper's wide open, most of the warmth rides straight up the chimney along with the exhaust — the same reason an open wood fire isn't an efficient heater. That's not a flaw; it's the point. Vented logs are the closest gas comes to a real wood fire, chosen for the look.
If it's heat you're after, a sealed [gas insert](/services/gas-insert-installation) or a properly sized ventless set — which burns with the damper closed — is the better tool. We'll help you pick honestly between looks and output.
Done right, and done legally
Whichever way you go, the fuel side is ours. Every gas log set needs a gas line run and connected by a licensed gas contractor — in North Carolina a showroom or a handyman legally can't do it, and we permit and pressure-test every line. We'll also make sure your existing chimney is sound enough to vent them.
Read our [vented vs. ventless guide](/guides/vented-vs-ventless-gas-logs) to see the tradeoff laid out, then call (828) 545-0525 for a free in-home assessment.
Related questions
- Do ventless gas fireplaces need any venting or chimney at all?
- Can gas logs be installed in any existing fireplace?
- Can I switch between vented and ventless gas logs in the same fireplace later on?
- Does the damper get removed or clamped when installing a gas insert?
- Does a gas fireplace vent through the wall or through the roof?
- Can I put a gas fireplace in my bedroom?
Still deciding? Talk to a real installer.
Free assessments across Western North Carolina — no pressure, straight answers.