Lennox LBC-4324 Fireplace Doors — Custom Exact-Fit Replacement
Replacement Glass Doors for the Lennox LBC-4324
The Lennox LBC-4324 is a 43-inch wood-burning fireplace from the Lennox Elite Series, a heat-circulating prefab model sold widely in the 2000s. The "C" in LBC stands for circulating: the unit draws room air around the firebox and pushes warmed air back out through louver grilles above and below the opening. Its radiant twin, the LBR-4324, shares the same firebox footprint, which is why doors for the two models are interchangeable. If your rating plate says LBC-43, LBC4324, LBC-4324-H (the herringbone-interior version), or LS-43ST, you are in the same family, and this page applies to you.
First, Confirm Your Model
Before ordering anything, verify what you have. Every prefab fireplace carries a metal rating plate or foil label, and on Lennox Elite units it is usually found in one of these spots:
- Inside the firebox, on the side wall or floor, sometimes behind or under the log grate
- Behind the bottom louver grille — most louvers lift or swing out without tools
- On the smoke shield just inside the top of the opening
Look for the model number (LBC-4324 or a close variant) and note the serial number too. If the plate is missing or unreadable, don't guess — snap a straight-on photo of the whole fireplace and let our AI Fireplace Expert identify it from the frame, louver pattern, and screen track. It takes about 15 seconds and it's free.
Why You Can't Just Buy the Original Doors Anymore
Lennox exited the hearth business years ago, and factory door kits for the Elite Series have long since dried up. Dealers no longer stock them, and the leftover OEM parts that surface online are usually the wrong finish, the wrong variant, or priced like collector's items. That leaves owners of a perfectly good fireplace hunting for a door that no longer officially exists.
The tempting shortcut — a universal or "masonry" fireplace door from a big-box store — is the wrong answer for a prefab like the LBC-4324, for three reasons:
- Prefab doors are inside-fit. A factory-built fireplace has a metal face with screen tracks, louvers, and precise clearances. The door frame must sit inside the opening against the firebox face, not overlap onto brick the way a masonry door does. An overlap-fit door on a prefab blocks louvers, gaps at the corners, and often simply cannot attach.
- Attachment points are model-specific. Prefab doors mount to the fireplace's own brackets and tracks. Universal doors assume you can drill into masonry — there is no masonry here, only sheet metal you should not be drilling blindly.
- Safety listing matters. The LBC-4324 was tested and UL-listed as a system. Doors designed for prefab fireplaces respect the airflow and clearance requirements that listing is based on. A random door that chokes off louver airflow can overheat the unit.
Our Solution: Doors Built to the 1/8 Inch
ExceptionalFire builds replacement doors specifically for prefab fireplaces like the Lennox LBC-4324. Instead of forcing a stock size to "close enough," we manufacture each door to your measured opening, to the nearest 1/8 inch, in your choice of frame finish and glass style. The frame is engineered as an inside-fit prefab door, so it seats correctly against the firebox face, clears the screen tracks, and leaves the circulating louvers unobstructed.
Getting there is simple:
- Identify: Upload a photo to the AI Fireplace Expert — it confirms your model in about 15 seconds.
- Price: See your price instantly in our prefab door collection — configure frame, finish, and glass online, no waiting for a quote.
- Measure: Follow the measuring guide — three width measurements, three height measurements, ten minutes with a tape measure. Even sister units of the same model can vary slightly after decades of service, so we always build from your numbers, not from a spec sheet.
For reference, published specifications for this family show a firebox roughly 43 inches wide and 24 inches tall at the opening — but treat that as a starting point only. Your door is built from your measurements.
A Word on Safety: Keep the Doors Open While Burning
On a wood-burning prefab like the LBC-4324, glass doors should be fully open whenever a fire is burning, with the mesh screen closed for spark protection. Closing glass doors on an active wood fire in a factory-built fireplace can trap heat beyond what the firebox was listed for. Close the doors only after the fire has died down — that is when they do their real job, stopping warm room air from escaping up the flue overnight and blocking cold downdrafts when the fireplace is idle.
Frequently Asked Questions
Will doors made for the Lennox LBR-4324 fit my LBC-4324?
Yes. The LBR-4324 (radiant) and LBC-4324 (heat-circulating) share the same firebox opening, so the same door dimensions apply to both. We still build from your measured opening to account for unit-to-unit variation.
My rating plate says LS-43ST — is that the same fireplace?
The LS-43ST is a closely related 43-inch Lennox Elite variant. Confirm with a photo through our AI Expert, then measure as usual; the ordering process is identical.
Can I install replacement fireplace doors on a prefab myself?
In most cases, yes. Inside-fit prefab doors attach to the existing firebox with supplied brackets — typically a screwdriver job of 20 to 30 minutes, no drilling into masonry and no permanent modification.
Do new glass doors stop the cold draft from my fireplace?
That draft is the number-one reason owners replace missing or broken prefab doors. A properly fitted, gasketed door dramatically reduces air exchange through the flue when the fireplace is not in use.
Ready to Fit Your LBC-4324?
Configure your doors online in minutes through the prefab door collection, or talk to a fireplace expert — we're available 7 days a week to check your measurements, confirm your model, and make sure the door that arrives is the door that fits.