Heatilator A36R Fireplace Doors — Custom Exact-Fit Replacement

Fireplace Doors for the Heatilator A36R — Built to Fit, Not "Close Enough"

The Heatilator A36R is one of the most widely installed 36-inch wood-burning fireplaces in North America. It belongs to Heatilator's Accelerator series — the "R" designates the radiant version — and it is a zero-clearance, factory-built firebox listed to UL 127 (ULC-S610 in Canada). The A36R has been in production for decades, which means there are enormous numbers of these fireplaces in homes built from the late twentieth century right up to today. Its close sibling, the A36RH, shares the same firebox and the same front opening; the H simply denotes a different refractory brick interior. If you have either model and you're looking for glass doors, everything on this page applies to you.

Step 1: Confirm Your Fireplace Is an A36R

Before ordering anything, verify the model. Every Heatilator fireplace carries a metal rating plate with the model and serial number. On A-series units it is typically found inside the firebox — look along the side wall or the smoke shield area at the top of the opening, or behind the mesh screen. On circulating variants you may also find it tucked behind or beneath the louvers on the face of the unit. Bring a flashlight and your phone: a quick photo of the plate is the fastest way to get a definitive answer. If the plate reads A36R or A36RH, you're in the right place. If the plate is missing or unreadable — common on fireplaces that have seen thirty years of fires — a photo of the fireplace face is usually enough for our team to identify it.

Why You Can't Just Buy "Universal" Doors for a Prefab Fireplace

Heatilator no longer offers original glass door accessories for many production years of the A-series, so owners of older A36R units routinely discover that the OEM door is discontinued or simply unavailable. That leaves the aftermarket — and this is where most people go wrong.

A prefab (factory-built) fireplace like the A36R is not a masonry fireplace, and doors designed for masonry openings do not belong on it:

• Exact-fit is mandatory. Per Heatilator's official specification sheet, the A36R fireplace opening is 36" wide by 23-3/8" high. A prefab door must match that opening precisely — a masonry-style door that overlaps the face can block cooling vents and trap heat in the metal chassis.
• Inside-fit design. Prefab doors mount inside the opening against the firebox face, using the existing attachment points. No drilling into the firebox, no modification of the appliance — altering a zero-clearance fireplace voids its safety listing.
• Listing and clearances. The A36R earned its UL 127 listing as a complete system. Doors engineered for prefab fireplaces respect the unit's airflow and clearance requirements; generic doors were never tested against them.

In short: the right door for an A36R is one built for the A36R.

How ExceptionalFire Builds Doors for Your A36R

We manufacture custom fireplace doors built to the 1/8", matched to your exact fireplace — not a one-size-fits-most frame that "should work." Here is the fastest path:

• Snap a photo. Upload a picture of your fireplace to our AI Fireplace Expert and get a model match in about 15 seconds. It recognizes the A36R face, screen, and louver layout and confirms what you have.
• See your price instantly. Browse the prefab door collection, pick your frame style, finish, and glass, and the configurator shows pricing on the spot — no waiting for a quote callback.
• We build to your numbers. Once you confirm measurements, your door is fabricated to your opening, to the 1/8", with inside-fit mounting made for zero-clearance fireboxes.

Measure Once, Order with Confidence

Even on a known model like the A36R, we always confirm the real opening — refractory panels, hearth height, and decades of settling can shift the numbers slightly from the factory drawing. Our measuring guide walks you through the three measurements we need (width at top and bottom, height at both sides) in under five minutes. Send us those figures and we take responsibility for the fit.

Safety: How Glass Doors Are Used on a Wood-Burning Prefab

Glass doors on a factory-built wood fireplace use tempered glass, and the rule is simple: burn with the doors fully open. Tempered glass is not designed to take direct, sustained flame contact the way a stove's ceramic glass does. Doors on a prefab fireplace are there to close after the fire dies down — sealing off the chimney draft so your heated (or air-conditioned) room air doesn't escape up the flue all night — and to keep sparks, pets, and curious hands away from a cooling firebox. Used this way, a well-fitted door pays for itself in energy savings while making the fireplace safer and better looking. Always follow the owner's manual for your specific unit.

Heatilator A36R Door FAQ

Will doors made for a Heatilator A36R also fit an A36RH?
Yes. The A36RH is the same firebox with a herringbone-pattern refractory interior; the front opening is identical, so the same door fits both models.

Can I burn wood with the glass doors closed on my A36R?
No. On prefab wood-burning fireplaces, tempered glass doors must be fully open during an active fire. Close them once the fire has burned down to keep conditioned air from escaping up the chimney.

The original Heatilator doors for my A36R are discontinued — what now?
This is the most common reason people find us. We build new custom doors matched to the A36R opening, in your choice of frame finish and glass, with inside-fit mounting designed for zero-clearance fireboxes.

What size door does a Heatilator A36R take?
Heatilator's specification sheet lists the A36R fireplace opening at 36" x 23-3/8". We still ask you to confirm your actual opening with our measuring guide before we build, because real-world openings can vary slightly — and we build to your numbers, to the 1/8".

Get Your A36R Doors Started Today

Configure your doors online in minutes through the prefab door collection, or start with a photo in the AI Fireplace Expert. Prefer to talk it through? Our fireplace specialists are available 7 days a week — send your rating-plate photo and measurements, and we'll take it from there.