Superior BR-36 Fireplace Doors — Custom Exact-Fit Replacement
Replacement Fireplace Doors for the Superior BR-36
The Superior BR-36 is one of the most common prefabricated wood-burning fireplaces in American homes. Sold from the mid-1970s through the 1990s as Superior's Standard Series 36-inch radiant fireplace, it was the builder's default choice for decades — which is why so many of them are still in service today, usually with missing, broken, or badly aged doors. If your fireplace was installed during a construction boom and the glass doors have seen better days, there's a good chance you're looking at a BR-36 or one of its close relatives.
First, confirm what you have. Every prefab fireplace carries a metal rating plate with the manufacturer and model number. On the BR-36 family it sits inside the firebox — typically on a side wall, on the floor of the smoke shelf area, or tucked behind the lower louvers below the opening. Shine a flashlight in and look for BR-36, BR36I, BRI-36, or BRF36. Later units may say Lennox instead of Superior — Lennox Hearth Products acquired the Superior brand, so the same firebox shipped under both names. Sibling models like the BC36, HC36, and RD36 share the same 36-inch platform.
Why You Can't Just Buy the Original Doors
Superior offered factory door kits for this fireplace — bi-fold glass doors in black, brushed brass, and brushed stainless, plus a twin-pane option. Those accessories have been discontinued for years. The brand passed from Superior to Lennox to Innovative Hearth Products, and along the way the original door tooling and part numbers quietly disappeared from dealer catalogs. What's left on the secondhand market is decades old, and stock "will-fit" doors sold by model number are made to one generic size that may or may not match your actual opening.
Universal masonry doors are not the answer either, for three reasons:
- Prefab needs an inside-fit door. A BR-36 has a sheet-metal face with louvers above and below the opening. Masonry doors overlap the face of the fireplace and would block those louvers, which the fireplace needs for cooling air. A prefab door must fit inside the opening itself.
- The attachment is different. Masonry doors anchor into brick with masonry fasteners. A prefab door attaches to the firebox structure without compromising the metal shell or the insulation behind it.
- The fireplace is a listed system. Zero-clearance fireplaces are safety-tested as a complete unit. Doors for a prefab must be designed for zero-clearance fireboxes — a bolted-on masonry door can interfere with airflow and clearances the listing depends on.
Our Approach: Custom Doors Built to the 1/8-Inch
ExceptionalFire builds replacement doors for the BR-36 the way the problem actually demands: to your measurements, not to a guess. Every door is made to order and sized to within an eighth of an inch of your opening, so the frame sits square, the glass panels meet cleanly, and there are no awkward gaps for smoke to smudge the surround.
Getting there is fast. Snap a photo of your fireplace and our AI Fireplace Expert will identify the model and recommend the right door style in about 15 seconds. Then open the configurator on our prefab door collection, enter your dimensions, pick your frame finish and glass, and you'll see your exact price immediately — no quote requests, no waiting for a callback.
How to Measure a BR-36 Opening
Here's the part most people get wrong: don't trust published specs, ours or anyone's. Two BR-36 fireboxes can present different usable openings depending on how the surround was finished, whether the fireplace was refaced with tile or stone, and how the original trim was installed. The "36" in the model name refers to the nominal firebox size, not a guaranteed opening dimension.
Measure the opening width at the top and the bottom, and the height at the left and right sides — prefab openings are rarely perfectly square, and we build to the numbers you give us. Note the position of the louvers and anything that protrudes into the opening. Our step-by-step measuring guide shows exactly where to put the tape, and it takes about five minutes with a helper holding the flashlight.
What Not to Do With BR-36 Doors
| Don't do this | Why |
|---|---|
| Burn wood with tempered-glass doors closed | Prefab doors use tempered glass, and the standard rule for a wood fire is doors fully open. Close them only as the fire dies down or when the fireplace is cold. Never operate with doors partially open — fully open or fully closed only. |
| Install masonry (overlap-fit) doors on a prefab | They block the cooling louvers and can't attach correctly to a metal firebox. |
| Guess the model from how it looks | Several 36-inch Superior and Lennox models look nearly identical. Verify the rating plate before ordering. |
| Order by model number alone | Trim, refacing, and installation quirks change the real opening. Measure every time. |
| Block or cover the louvers | The fireplace listing depends on that airflow to keep surrounding framing safe. |
Superior BR-36 Door FAQ
Will replacement doors for a Superior BR36I or BRI-36 fit my BR-36?
They're variants of the same 36-inch platform, so door sizing is usually in the same range — but "usually" isn't good enough for an inside-fit door. Since every ExceptionalFire door is built to your measurements, the variant matters less than the tape measure. Measure your opening and you're covered either way.
My rating plate says Lennox, not Superior — do I still have a BR-36?
Very likely yes. Lennox Hearth Products sold the same fireboxes under its own name after acquiring Superior. If the model number on the plate reads BR-36, BR36I, or similar, the door solution is identical.
Can I close the glass doors while a fire is burning in my Superior BR-36?
No. Tempered glass on prefab fireplace doors is meant for open-door burning; keep the doors fully open during an active wood fire and close them once the fire is out to stop heated room air from escaping up the flue. That draft-stopping job is where glass doors earn their keep.
How much do custom replacement doors for a Superior BR-36 cost?
Price depends on your exact dimensions, frame finish, and glass options — which is why we put the configurator online. Enter your measurements and you'll see your price instantly, before you commit to anything.
Ready to Fix It for Good?
Grab your measurements and configure your BR-36 doors online for an instant price, or start with a photo and let the AI Fireplace Expert confirm your model in 15 seconds. Prefer a human? Our fireplace specialists are available seven days a week — send us a photo of your rating plate and opening, and we'll walk you through it.