Will a gas insert seal off the drafts and old smoke odors coming from my open fireplace chimney?
Yes — that's one of the best reasons to install one. A gas insert slides into your existing masonry firebox with a sealed liner and a surround panel that closes off the old opening, so the giant open flue that was pulling heated air out of your house all winter is capped. Drafts stop, and the stale creosote and smoke smell that wafts back down on damp days goes with them.
The problem with an open flue
An open masonry fireplace is essentially a hole in your house: even when there's no fire, that big flue pulls heated air up and out all winter, and on damp or humid days the creosote-soaked masonry breathes stale smoke smell back down into the room. It's the classic "why do I smell smoke when nothing's burning" complaint we hear from older Asheville homes every year. An open fireplace can actually run a net heat loss for exactly this reason.
How the insert seals it
A [gas insert](/services/gas-insert-installation) slides into your existing firebox and does two things that fix it. First, a sealed stainless liner runs up the chimney and caps the flue, so the great open draft that was siphoning your heated air is closed off. Second, a surround panel seals the face of the old opening. Combustion is fully sealed and direct-vented, so the only thing moving through that chimney now is the insert's own exhaust — the drafts stop, and the old smoke and creosote odor goes with them. We [inspect the flue](/services/fireplace-inspection) and size the liner correctly as part of the job.
The upgrade you actually feel
The payoff isn't just clean air and no draft — it's heat. Where the open fireplace was a net heat loss, the insert commonly runs 70% efficient or better and warms the room, with millivolt or battery-backup ignition options that keep the heat coming when the power's out. After Helene, the homes that stayed warm were the ones with a working hearth, and a sealed insert — or a full [wood-to-gas conversion](/services/wood-to-gas-conversion) — turns a leaky decorative fireplace into exactly that. Book a free assessment at (828) 545-0525.
Related questions
- Does replacing an open wood fireplace with an insert improve the air in my house?
- Can an unused fireplace or chimney cause moisture and mold problems in the house?
- Why do I smell smoke in my house when the fireplace isn't even burning?
- Does a direct vent gas fireplace use the air in my room for combustion?
- Do gas fireplace inserts burn cleaner than gas log sets?
- Do gas fireplaces affect indoor air quality?
Still deciding? Talk to a real installer.
Free assessments across Western North Carolina — no pressure, straight answers.