White Mountain Hearth Boulevard 48" See-Through Linear Vent-Free Fireplace

The Boulevard 48" See-Through Vent-Free Linear Fireplace from White Mountain Hearth is built around a single, genuinely clever idea: one fireplace, two rooms. A 48-inch-wide by 12-inch-tall viewing opening passes cleanly through an interior wall, delivering both the visual drama of open flame and up to 36,000 BTU of real, room-warming heat to spaces on either side — simultaneously.

Because it's fully vent-free, there's no flue, no chase, and no chimney to plan around. The fireplace draws on room air for combustion and returns heat at a rated efficiency of 99.9%, making it one of the most thermally efficient ways to add a fire feature to a home. The framing footprint — 54.5 inches wide, 41.625 inches tall, and 12 inches deep — is substantial but purpose-built for a clean, built-in appearance once trimmed out.

Control is handled by the ProFlame IP Electronic Control system paired with a variable thermostat remote. The electronic variable gas valve allows true flame modulation between the 25,000 BTU minimum and 36,000 BTU maximum outputs, so you're not locked into "full blast or nothing." Ignition is intermittent pilot (IP), meaning there's no standing pilot burning fuel when the fireplace isn't in use — a quietly useful detail that adds up over a heating season.

The firebox ships ready for glass media: approximately 3 square feet of crushed glass is required (sold separately), and the unit is also compatible with glass drops and decorative rocks. For a more traditional look, driftwood ceramic fiber log sets are available as an optional accessory. Accent light kits and decorative trim kits round out the accessory catalog, offering meaningful customization without requiring a trip back to the drawing board.

A fine mesh barrier screen is included, addressing the open-face safety considerations that come with a vent-free design at this scale. The non-clearance classification and interior wall installation type make it straightforward to spec into new construction or a thoughtfully planned renovation.

The VFLB48SP90N is the natural gas configuration. A liquid propane version (VFLB48SP90P) is available separately. The unit is manufactured in the United States and backed by a 5-year limited warranty on the fireplace, a 5-year limited labor warranty, and a 1-year limited warranty covering remote controls and lighting systems.

If your floor plan has always quietly demanded a fireplace that works from both sides of the wall, this is the engineering answer to that problem.

• 48" wide × 12" tall see-through opening serves two rooms from a single fireplace
• 36,000 BTU maximum output / 25,000 BTU minimum — variable via electronic gas valve
• 99.9% efficiency rating — vent-free design keeps virtually all heat in the living space
• ProFlame IP Electronic Control with variable thermostat remote included
• Intermittent pilot ignition — no standing pilot, no wasted fuel when not in use
• Requires approximately 3 sq. ft. of crushed glass media (sold separately); also compatible with glass drops and decorative rocks
• Fine mesh barrier screen included
• Non-clearance rating; designed for interior wall installation
• Framing dimensions: 54.5" W × 41.625" H × 12" D
• Optional accessories: driftwood log sets, accent light kits, decorative trim kits (all sold separately)
• Natural gas configuration; LP version (VFLB48SP90P) available separately
• Manufactured in the United States
• 5-year limited fireplace warranty; 5-year limited labor warranty; 1-year warranty on remote and lighting systems