Martin SF36 Fireplace Doors — Custom Exact-Fit Replacement
Replacement Doors for the Martin SF36 Wood-Burning Fireplace
The Martin SF36 is a 36-inch wood-burning, factory-built (prefab) fireplace that Martin Industries of Florence, Alabama shipped into countless homes through the 1980s and 1990s. If yours still works, there's no reason to replace it — but the original glass doors rarely survive three or four decades of heat cycles, and the company that made them no longer exists. This page covers how to confirm you actually have an SF36, why a universal door won't work, and how we build an exact-fit replacement for it.
First, confirm the model. Open the mesh screens and look for the metal rating plate inside the firebox — usually riveted to a side wall of the smoke shield area, or visible behind the lower louvers or grille at the bottom face of the unit (a flashlight and a phone camera help). The SF36 family includes several closely related designations: SF36, SF36I, SCF36, and SCF36I generally share the same door footprint. Be careful with suffixes, though — an SF36A is a different unit that takes a different door, so write down the full model number exactly as stamped, letters included. If the plate is painted over or missing, a photo of the fireplace face is usually enough for us to identify it.
Why You Can't Buy the Original Door Anymore
Martin Industries filed for Chapter 11 bankruptcy at the end of 2002 and sold its assets to Monessen Hearth Systems, closing for good in 2003. Factory door kits for the SF36 have not been produced since, and the trickle of "new old stock" on auction sites is unpredictable in condition and fit.
The tempting shortcut — a universal or masonry-style fireplace door — is the wrong answer for a prefab like the SF36, for three reasons:
- Prefab fireplaces need an inside-fit door. The door frame must sit inside the firebox opening against the metal face, not overlap onto the surround the way masonry doors do. An overlap-fit door can block louvers and air openings the unit needs.
- The listing matters. A factory-built fireplace is a tested, listed appliance. Its cooling-air paths and clearances are part of that listing. A door that restricts airflow around the firebox can cause overheating of the chase and framing behind it.
- Tolerances are tight. Aftermarket listings put the SF36 opening at a nominal 36 inches wide by roughly 19-3/8 inches tall — but installed units vary with age, settling, and field trimming. "Close enough" on a prefab door means visible gaps, rattling panels, or a door that simply won't seat.
Our Approach: Doors Built to the 1/8 Inch
We don't stock a one-size SF36 door and hope it fits. Every door is fabricated to the measurements of your opening, built to the 1/8". That's the difference between a door that looks factory-original and one that announces itself as an aftermarket patch.
Two ways to start:
- Photo match in about 15 seconds. Upload a picture of your fireplace to our AI Fireplace Expert and it will confirm the model family and tell you exactly which door style and measurements you need.
- Configure and price instantly. Open the prefab door collection, enter your dimensions, pick frame finish, glass tint, and handle style, and see your price on the spot — no "request a quote" email loop.
Doors ship as a complete kit with the frame and hardware, and install into the existing opening with basic hand tools. No welding, no modification of the fireplace itself.
How to Measure Your SF36 Opening
You need three numbers: opening width (measure at top, middle, and bottom — use the smallest), opening height (left, center, right — again the smallest), and the depth of any obstructions like screen tracks or bent lintel edges. The whole job takes five minutes with a tape measure. Our step-by-step measuring guide shows exactly where to hook the tape on a prefab firebox, with photos, so your custom door arrives right the first time.
What NOT to Do With an SF36 Door
| Don't | Why |
|---|---|
| Burn with the glass doors closed | Prefab doors like these use tempered glass and are designed to be fully open while a fire is burning. Close them only as the fire dies down or when the fireplace is cold, to stop draft loss up the flue. |
| Force an overlap-fit masonry door onto the unit | It can block cooling louvers and violates the fireplace's listing. |
| Grind, drill, or bend the firebox to make a wrong-size door fit | Modifying a listed appliance is a safety and insurance problem, and it's irreversible. |
| Order by width alone | "36-inch Martin" covers multiple door footprints. SF36 and SF36A are not interchangeable — match the full model number or send a photo. |
| Reuse cracked or chipped tempered glass | Tempered glass with edge damage can fail suddenly. Replace the panel, don't tape it. |
Frequently Asked Questions
Can I burn a fire with the glass doors closed on a Martin SF36?
No. Like virtually all prefab fireplace doors with tempered glass, they should be fully open during an active fire. Their real job is stopping heated room air from escaping up the chimney when the fireplace is idle — which is where most of your energy loss happens.
What size fireplace doors fit a Martin SF36?
Retail listings cite a nominal 36" x 19-3/8" opening, but installed openings vary, so we build each door to your measured dimensions rather than shipping a generic size. Measure per our guide or send a photo for verification.
My rating plate says SCF36I — is that the same door as the SF36?
Yes, the SF36, SF36I, SCF36, and SCF36I share the same door footprint. The SF36A does not, so always confirm the full model number.
Are replacement doors still made for Martin fireplaces at all?
Not by the original factory — Martin Industries closed in 2003. Custom-fabricated exact-fit doors, like ours, are the reliable route for every Martin prefab model still in service.
Get Your SF36 Door Started Today
Configure your custom Martin SF36 door online in a few minutes with instant pricing, or upload a photo to the AI Fireplace Expert and let it do the identifying. Prefer a human? Our fireplace specialists are available seven days a week to check your model, review your measurements, and make sure the door you order is the door that fits.