Heatilator E39 Fireplace Doors — Custom Exact-Fit Replacement
First, Confirm What You Have
The Heatilator E39 is the 39-inch model in Heatilator's E & EC Series of factory-built (prefab) wood-burning fireplaces, sold roughly from the mid-1980s through the mid-2000s. The same firebox shipped under several closely related model numbers: E39 (radiant), EC39 (heat-circulating, with air grilles above and below the opening), and the insulated variants E39I and EC39I. All share the same nominal 39-inch viewing width, so the door solution is the same family.
To confirm your model, find the metal rating plate. On these units it sits inside the firebox — typically on a side wall of the smoke shield area — or tucked behind the lower louver/grille panel on EC models. Let the fireplace cool completely, slide the mesh screen aside, and check the upper corners and side walls with a flashlight. The plate lists the model number, serial number, and listing information. A photo of that plate is the single most useful thing you can have on hand when ordering doors.
Why You Can't Just Buy the Original Doors Anymore
Heatilator offered factory glass doors for this unit — the DM1039 bifold kit in black, polished brass (DM1039B), and stainless (DM1039S). The E/EC Series has long since been retired, and those original door kits are no longer in regular production, so sourcing one today usually means hunting for old stock or used parts with no choice of finish.
Interestingly, even when the line was current, the 39-inch size was the odd one out: Heatilator's Perception (DP) and arched cabinet (DMA) door styles were offered for the 36-inch and 42-inch units but not for the 39. If your opening measures around 39 inches wide, you've always had fewer off-the-shelf options — which is exactly why a custom-built door is the right answer now.
And no, a generic "universal" masonry door won't do. A factory-built fireplace like the E39 has a sheet-metal face with cooling slots and louvers that must never be blocked, and the manual is explicit that nothing may cover the opening in a way that interferes with an authorized glass door. Prefab doors mount inside the firebox opening (inside-fit) and attach to the firebox itself — masonry doors overlap the face and clamp to brick, which simply doesn't exist here. A prefab door has to match your opening precisely and be built for this application. Close enough isn't close enough.
Our Path: Custom Doors Built to the 1/8"
ExceptionalFire builds replacement doors for the E39 family to your actual opening dimensions, in 1/8-inch increments. That matters because two "identical" E39 installations rarely measure identically — refractory panels, hearth height, and decades of settling all shift the numbers. We don't ship a one-size box; we build your door.
Here's how it works:
- Identify: Not sure it's an E39? Snap a photo of the fireplace (and the rating plate if you can find it) and our AI Fireplace Expert will match it in about 15 seconds.
- Configure: Enter your measurements in the configurator on our prefab door collection, pick frame finish and glass style, and see your exact price instantly — no "request a quote" runaround.
- Install: Doors arrive fully assembled with mounting hardware. Installation is a screwdriver-and-20-minutes job for most homeowners.
How to Measure Your E39 Opening
You need three numbers: opening width (measure at top, middle, and bottom — use the smallest), opening height (left, center, right — smallest again), and the depth of flat mounting surface inside the opening. The factory manual itself tells installers to check the opening for square by comparing diagonals, and older units are often slightly out of square — that's normal, and it's exactly what the 1/8-inch build tolerance absorbs. Our step-by-step measuring guide walks you through it with photos; the whole job takes five minutes with a tape measure.
What NOT to Do with E39 Doors
| Don't | Why |
|---|---|
| Burn with the glass doors closed | Prefab fireplace doors use tempered glass and are meant to be fully open during the fire, with the mesh screen closed. The Heatilator manual states doors must be fully open or fully closed — never partway — and that the most efficient operation is doors open. Close them as the fire dies down to stop warm room air from escaping up the chimney. |
| Install a masonry/overlap door | It can block louvers and cooling slots on the metal face — a fire hazard on a factory-built unit. |
| Guess the size from the model number | "39" is the nominal viewing width, not your door size. Actual openings vary by installation. Measure. |
| Cover the black metal face with combustible trim | Only noncombustible materials (tile, stone, brick) may cover it, per the manufacturer. |
| Use doors to hold burning material in | Doors and screens are spark and draft control, not a containment system for an overloaded firebox. |
Frequently Asked Questions
Will fireplace doors for a Heatilator E39 fit my EC39 or EC39I?
Yes — E39, E39I, EC39, and EC39I share the same 39-inch firebox family. The circulating (EC) versions add grille panels above and below the opening, which our inside-fit doors don't obstruct. We still build to your measured opening, so every variant is covered.
Can I burn wood with the glass doors closed on a Heatilator E39?
No. Keep the doors fully open while the fire is burning, with the screen closed. Tempered glass isn't made for direct sustained fire exposure with the doors shut. Closed doors are for when the fire is dying out or the fireplace is idle — that's when they earn their keep by blocking heat loss and drafts.
Are the original Heatilator DM1039 doors still available?
The DM1039 bifold kits are out of regular production along with the E/EC Series itself. Occasionally old stock surfaces, but finishes and condition are a lottery. A custom-built replacement gives you a new door, your choice of finish, and an exact fit.
What size fireplace doors do I need for a Heatilator EC39?
Start from your own tape measure, not a chart. The nominal width is 39 inches, but real openings differ unit to unit. Measure width and height at three points each, take the smallest, and enter them in the configurator — we build to the 1/8 inch.
Get Your Exact-Fit E39 Doors
Configure your Heatilator E39 fireplace doors online in minutes on the prefab door collection — instant pricing, no waiting on quotes. Prefer a human check first? Send a photo to the AI Fireplace Expert or talk to a real door specialist, 7 days a week. Measure once, order once, done.