Marco C36 Fireplace Doors — Custom Replacement Doors Built to Order

Fireplace Doors for the Marco C36 Series

Somewhere on your fireplace there is a small metal tag, and if it reads C36HC, C36CF, C36HCI, CM36HC, CM36HCD — or shows a catalog number like 792759 — you own a Marco C36-series prefabricated wood-burning fireplace. These 36-inch zero-clearance boxes went into tract homes and remodels by the thousands, and their factory bi-fold doors have now outlived the company that made them. Marco is gone, replacement parts exist only through aftermarket channels, and homeowners searching for "Marco 792759 door" quickly discover that nobody stocks an original. The good news: a made-to-measure door is a genuine upgrade over what the factory shipped, and you can price one in minutes.

Start with the tag, not the tape measure

Marco used both a model name and a seven-digit catalog number, and dealers cross-referenced doors by either one. Find the rating plate — usually a riveted metal tag just inside the firebox opening or tucked behind the mesh screen — and write down everything on it. Suppliers list the C36HC (792759) opening at 36 x 22 1/4 inches, which tells you which family you are in, but the tag is what confirms it. Can't find a tag after all these years of soot? Snap a photo of the whole fireplace face and let our AI Fireplace Expert identify the family from the frame, louvers and screen details.

C36 or B36? Two different Marco 36s

Marco built several 36-inch lines, and the C-series is not the same unit as the B-series (B36CF, B36HC and friends) even though both take a nominally 36-inch-wide door. Trim profiles, louver arrangements and door frames differ between the lines, and aftermarket sellers list them as separate applications. If your tag points to a B-series box, head over to our dedicated Marco B36 page instead. The same warning applies in the other direction — a door sized for one family from a cross-reference chart may sit wrong on the other, which is why we build from your measured opening every time.

Why the original doors are gone — and what that means

When Marco closed, the tooling for its glass door assemblies closed with it. That leaves three paths for a C36 owner. Generic "universal" doors are built to average dimensions and almost always show gaps on a real opening. Masonry-style overlap doors are engineered to anchor into brick, not a listed steel firebox — mounting one on a C36 face means fasteners in places the engineers never intended and heat trapped against the shell. The third path is a true inside-fit prefab door built to your opening, which is the only approach that respects both the appearance and the safety listing of a zero-clearance fireplace. One more thing while we are on safety: standard tempered glass doors should be fully open while a fire is burning — closing them on an active fire stresses the glass and overheats the box. And never block the upper or lower louvers; the C36 relies on that airflow to keep surrounding framing cool.

The ExceptionalFire route

• Identify. Rating plate or photo review — we confirm your C36 variant before anything is built.
• Configure. In our prefab fireplace door collection you choose frame, finish, glass and mesh, enter your measurements, and the configurator prices the door instantly.
• Install. Inside-fit design with prefab-safe attachment — no drilling into the firebox shell, no guesswork on site.

Measure twice, order once

Openings on thirty-year-old prefabs are rarely square. Take width readings at the top, middle and bottom of the opening and height readings at the left, center and right, then record the smallest of each. Our measuring guide shows exactly where to hold the tape, and when we verify your numbers together your order is covered by the Perfect Fit Guarantee.

Frequently asked questions

Is a factory door for the C36HC still available anywhere? No — Marco is out of business and original doors are no longer produced. Every current option is aftermarket, and a custom-measured door is the safest of them.

My tag says CM36HC — is that the same as C36HC? Aftermarket door listings group CM36HC and CM36HCD with the C36 family, so you are on the right page. We still build from your measurements, not the family label.

Can I keep the doors closed while the fire burns? Not with standard tempered glass — burn with the doors open. Talk to our team if closed-door burning is a priority for your setup.

Where do I find the catalog number like 792759? On the metal rating plate inside the opening, often behind the screen. If it is illegible, our AI Fireplace Expert can identify the unit from a photo.

Get your exact-fit C36 door

Price a custom Marco C36 replacement door online right now, or reach a fireplace door specialist seven days a week. Start configuring in the prefab fireplace door collection, and see every fireplace family we cover in the doors-by-model guide.

More Marco models we build doors for: Marco 792794 · Marco B36 · Marco B41HC · Marco C41 (792848 / 792849) · Marco D41 · Marco D36