Preway FF48 Fireplace Doors — Custom Replacement Doors That Fit Right
Fireplace Doors for the Preway FF48
Most factory-built fireplaces of the 1970s and 1980s were 36-inch boxes. The Preway FF48 was the exception — the model with the largest door opening in Preway's published size charts, at 42 inches wide by 23 inches tall. Units this size usually went into the showpiece rooms: great rooms with vaulted ceilings, lake cabins, family rooms with full-height stone or paneled surrounds. Preway itself, once a major appliance maker based in Wisconsin Rapids, Wisconsin, disappeared around the end of the 1980s, which leaves every FF48 owner in the same spot: a large, prominent fireplace with aging or missing doors and no manufacturer to call. Here is how to close that opening properly.
Why a big opening is the hardest one to re-door
Door problems scale with width. A 42-inch span means longer frame rails, heavier glass, and four bi-fold panels that all have to track true — on a bargain frame, that much steel and glass sags within a few seasons, and sagging panels stop meeting in the middle. Wide spans also expose sloppy tolerances: a gap that hides on a small door shows as a visible line of dark firebox around the entire perimeter of a big one. Oversized "universal" doors try to solve this with adjustable filler panels, and on a fireplace this prominent the result looks like what it is — a patch. A door for the FF48 should be built to the opening, not adjusted toward it.
Confirm it's an FF48, not its BE48 sibling
Preway's 48-class included both the BE48 and the FF48, and aftermarket size charts list the identical 42 x 23 opening for the two. They differ in face and trim details rather than glass size, so identification matters mostly for accessories and records. Find the rating plate — a metal tag inside the firebox, usually low on a side wall or behind the bottom louver panel — and note the full model string. Can't read it? Photograph the fireplace straight-on and upload it to the AI Fireplace Expert; Preway's louver and face geometry is distinctive enough to identify from a picture.
Measure it like a custom job — because it is one
Chart dimensions are a reference, not a spec sheet. Large fireplaces attract heavy facings — fieldstone, full brick, thick tile — and those facings frequently crowd the opening by a fraction of an inch on one side or along the top. Follow our measuring guide: width at top, middle, and bottom; height at left, center, and right; record the smallest of each. Those two numbers, not "42 x 23," are what your doors get built to, and they are what the Perfect Fit Guarantee stands behind. Never assume a standard dimension on a unit that has been in a wall for forty years.
What to avoid on a fireplace this size
Three warnings, all learned from customer photos. Don't hang a masonry-style overlap door on it: the FF48 is a metal appliance whose face conceals cooling-air louvers that an overlap frame would smother, and there is no mortar to anchor into. Don't burn hot fires behind closed tempered glass: tempered panels on prefab doors are made for open-door burning, and across 42 inches of glass a thermal failure is dramatic. And don't let anyone drill fresh mounting holes through the firebox shell — inside-fit doors attach within the opening precisely so the listed firebox stays untouched.
The ExceptionalFire route
- Identify. Rating plate or photo — our AI Fireplace Expert confirms the model before you spend a dollar.
- Configure. In the prefab fireplace door collection you enter your measured opening and choose frame, finish, glass, and mesh, with the price updating live as you build.
- Install. Your doors ship assembled, sized to your numbers, with prefab-safe inside-fit attachment. Most owners mount them in twenty to thirty minutes.
Frequently asked questions
Does anyone still make original FF48 doors? No — Preway has been gone since roughly the late 1980s, and no OEM production survives. Everything available today is aftermarket: either a handful of stock enclosures made to the 48-class chart size, or doors custom-built to your opening.
Are BE48 and FF48 doors interchangeable? Published charts give both models the same 42 x 23 opening, so a door measured correctly for one will normally fit the other. We build from your tape measure either way.
Is closed-door burning possible on an FF48? Only with high-temperature ceramic glass, ordered as an upgrade. Standard tempered glass means doors open while the fire burns, then closed as it dies down to keep conditioned air from escaping overnight.
Where do I find the model number? On the firebox rating plate — check the interior side walls near the opening and behind the lower grille. Decades of soot may hide it; a flashlight and a rag usually recover the text.
Order doors for your FF48
A fireplace this central to a room deserves doors that look built-in — because they are. Measure the opening and configure online for an instant price, or send photos and let our experts, available seven days a week, verify the model first. More discontinued prefab models are covered in our doors-by-model guides.