FMI / Desa B42 Fireplace Doors — Custom Exact-Fit Replacement
Fireplace Doors for the FMI / Desa B42
The B42 is the 42-inch member of the Bungalow family — the wood-burning builder firebox that DESA International and its FMI successor shipped under half a dozen badges through the 1990s and 2000s. Published aftermarket size charts agree on its door opening: 42 inches wide by 21-3/8 inches tall, the wide version of the 36 x 21-3/8 opening on its little brother, the B36. The fireplace outlived its maker — DESA went into bankruptcy in December 2008, and the corporate trail that followed never brought the Bungalow's brands back. Your firebox is fine. Its parts ecosystem is not. Doors are the part of that story we solve.
Decode your rating plate
The Bungalow 42 shipped in variants — plain B42, louvered B42L, and related versions — and under sibling badges: a plate reading VB42 points to our Vantage Hearth VB42 page, and Comfort Flame's B42LI-M twin lives on our Comfort Flame page. Same firebox family, different labels — the aftermarket treats them as one opening, and so do we. Find the metal plate inside the firebox on a side wall or behind the lower grille; if decades of fires have made it unreadable, a straight-on photo through our AI Fireplace Expert identifies the family and the correct fit style.
Why the B42 needs a measured door
- No factory door exists. The manufacturer is gone; nothing original is being made. Every door for a B42 today is aftermarket, and mass-produced ones are built to the chart, not to your fireplace.
- The louver rule. Louvered variants move room air around the firebox through those banks — a door must leave them completely clear.
- Inside-fit only. The Bungalow is a zero-clearance sheet-metal appliance. Doors mount within the opening; masonry overlap doors have nothing safe to clamp onto.
- Twenty-plus years of drift. Refacing, raised hearths, and settling all change what 42 x 21-3/8 measures today. The chart is the starting point; the tape measure is the truth.
How ExceptionalFire solves it
- Identify. Plate or photo — model and fit style confirmed before you spend a dollar.
- Measure. Width measured at three heights, height measured at three points across, smallest numbers ruling, per our measuring guide.
- Configure. Frame, finish, glass, and mesh in the prefab fireplace door collection — priced instantly, built in the USA, backed by the Perfect Fit Guarantee.
Frequently asked questions
What size door fits an FMI or Desa B42? Published charts list a 42" x 21-3/8" opening for the B42 and B42L. Measure your installed opening before ordering — installations this age drift.
My fireplace says Vantage Hearth or Comfort Flame, not FMI. Same door? Same Bungalow firebox family under a different badge. Confirm your model string, measure, and order to your numbers — and see the dedicated pages for those badges.
Can I still buy an original B42 door? No — the manufacturer's 2008 bankruptcy ended factory support. Aftermarket or custom-built are the options.
Can I burn with the new doors closed? Only with glass rated for it. Standard tempered glass stays open during a fire. Ceramic glass exists for exactly that job — ask about it while configuring.
Get your exact-fit B42 door
Configure your B42 door online for an instant price, backed by the Perfect Fit Guarantee, or talk to a fireplace door specialist seven days a week. Made in the USA, built to your measurements — not to a defunct catalog.
More FMI models we build doors for: B36 · Craftsman C36 · Craftsman C42 · 3600 · 42E · all fireplace models