Monessen Lo-Rider 42 Vent-Free Firebox

Clean-face circulating firebox with an angled interior and air channels designed to move warmth from a separately installed log heater into the room. Curtain mesh screens retract into concealed side pockets.

Gas-line access points and a junction box support the separately planned gas and electrical connections.

Flush-hearth design with a taller opening. Select traditional concrete, gray stacked, gray herringbone or brown stacked liner configuration; the supplied liner follows that model suffix.

Select a compatible listed vent-free gas log heater, matching burner, fuel type and controls separately. The heater must fit the firebox's minimum internal dimensions and remain within its 40,000 BTU/hr limit. This enclosure alone does not produce heat.

A regulated gas supply, site-appropriate framing, finishing materials, combustion/ventilation air and professional installation are required. Logs and burner must follow their own installation instructions as well as the firebox manual.

Install the supplied hood or canopies as directed. Plan electrical supply before closing the wall when using lights, a fan or electrically powered controls. Installation, materials, gas work, finishing, delivery, accessories and tax are separate.

Optional GFK-160VF fan and MONAL-VF accent light kit. The light kit operates on 120 VAC, 60 Hz and may illuminate the firebox with or without the gas flame.

Fronts and Doors: Doors - Operable; Front — Black. Model-listed options are separately selected. Mantel, shelf and surround choices still require site clearance review.

Lighting: Accent Light Kit. Model-listed options are separately selected. Mantel, shelf and surround choices still require site clearance review.

Mantel Shelves: Baxter 72" — Primed; Baxter 72" — Unfinished; Crosby 72" — Unfinished; Crosby 72" — Primed; Fillmore 72" — Unfinished; Fillmore 72" — Primed; Non-Combustible Cove Gray 60"; Non-Combustible Cove Gray 72"; Non-Combustible Midnight Mist 60"; Non-Combustible Midnight Mist 72"; Non-Combustible Tavern Brown 60"; Non-Combustible Tavern Brown 72"; Non-Combustible Washed Cedar 60"; Non-Combustible Washed Cedar 72"; Non-Combustible Weathered Barnwood 60"; Non-Combustible Weathered Barnwood 72"; Non-Combustible White 60"; Non-Combustible White 72"; Ozark 72" — Primed; Ozark 72" — Distressed Knotty Alder; Ozark 72" — Unfinished. Model-listed options are separately selected. Mantel, shelf and surround choices still require site clearance review.

Mantels: Battlefield C — Primed; Battlefield C — Distressed Knotty Alder; Corbels; Kenwood C — Unfinished; Kenwood C — Primed; Laurel C — Primed; Malone C — Primed; Merritt C — Primed; Roxborough C — Primed; Walker C — Primed; Wescott C — Primed; Zimmer C — Primed. Model-listed options are separately selected. Mantel, shelf and surround choices still require site clearance review.

Powered Fans: Fan. Model-listed options are separately selected. Mantel, shelf and surround choices still require site clearance review.

Additional installation accessories: AKD outside-air kit; LCUF42CR matching trim kit. Outside-air kit is optional unless required by the installation or local rules; ducting is separate.

For approved vent-free gas log heaters only; never burn wood or other solid fuel. The system is supplemental heat or decorative use, not a primary heating system.

Location, room air supply, fuel choice and local permission for vent-free use must be checked by the installer. Maintain unobstructed combustion and ventilation openings and follow both the heater and firebox manuals.

Keep furniture and other flammable objects at least 36 in from the front. Mantel height depends on projection; follow the manual's diagrams. Carpet and vinyl have special hearth requirements and must not be assumed safe next to a flush opening.

Photos show complete installations with separate log heaters, burners, optional trim, liners and room finishes. Shared series photos may depict another size.

The website's 36-inch viewing width and the brochure's viewing height/framing height differ from the current manual. Specifications here follow the November 2025 LCUF manual; confirm the exact shipped unit before construction.