How to measure (60 seconds)
- Wall width: measure the finished wall area available (inches).
- Recess depth available: confirm at least 6" of depth for recessed installs (per manual).
- Outlet / wiring: plan power access (dedicated circuit recommended).
- TV above: follow TV manufacturer guidance; the manual calls for 11.8" minimum clearance above the glass to TV/mantel/ceiling.
Clearance note
Keep combustible materials at least 3 feet (0.9 m) from the front of the fireplace. Minimum clearance above the glass is 11.8" (300 mm) to a TV, mantel, or ceiling (per manual).
Fit requirements table (hard constraints)
Recessed framed opening dimensions below are the minimum finished opening requirements (per manual). All Orion Slim models operate on standard 120V power and include 5,000 BTU supplemental heat.
| Size | Model (SKU) | Viewing area (W×H) | Firebox (W×H×D) | Recessed framing / cutout (W×H×D) | Heat (standard) | Heat (optional) | Power + breaker | Link |
|---|---|---|---|---|---|---|---|---|
| 52" | OR52-SLIM | 47-7/8" W × 14-3/8" H | 50-1/4" W × 18-3/4" H × 5-3/4" D | 50-3/4" W × 19-1/8" H × 6" min. D | 120V 60Hz, 1,465W, 5,000 BTU | — | Dedicated 120V circuit. Use a dedicated 20A (or higher) breaker (per manual). Hardwire by a qualified electrician when required. |
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| 60" | OR60-SLIM | 55-1/2" W × 14-3/8" H | 58" W × 18-3/4" H × 5-3/4" D | 58-1/2" W × 19-1/8" H × 6" min. D | 120V 60Hz, 1,465W, 5,000 BTU | — | Dedicated 120V circuit. Use a dedicated 20A (or higher) breaker (per manual). Hardwire by a qualified electrician when required. |
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| 76" | OR76-SLIM | 72-3/16" W × 14-3/8" H | 74-5/8" W × 18-3/4" H × 5-3/4" D | 75-1/8" W × 19-1/8" H × 6" min. D | 120V 60Hz, 1,465W, 5,000 BTU | — | Dedicated 120V circuit. Use a dedicated 20A (or higher) breaker (per manual). Hardwire by a qualified electrician when required. |
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| 100" | OR100-SLIM | 96-7/16" W × 14-3/8" H | 98-7/8" W × 18-3/4" H × 5-3/4" D | 99-1/2" W × 19-1/8" H × 6" min. D | 120V 60Hz, 1,465W, 5,000 BTU | — | Dedicated 120V circuit. Use a dedicated 20A (or higher) breaker (per manual). Hardwire by a qualified electrician when required. |
View on product page |
Installation type selector
This model line supports recessed (built-in) and wall-mount installation (per manual).
Recessed: finished opening dimensions
Use the “Recessed framing / cutout” dimensions in the fit table. Minimum depth is 6" for all sizes (per manual).
Electrical: Use a dedicated 120V circuit. The manual specifies a dedicated 20A (or higher) breaker. Hardwiring should be completed by a qualified electrician and must follow national and local electrical codes.
Wall-mount notes
No cutout is required for wall-mount installation. Secure mounting hardware to wall studs and maintain required clearances. The manual calls for 11.8" minimum clearance above the glass to a TV/mantel/ceiling and 36" clearance from combustibles in front.
Electrical: Use a dedicated 120V circuit with a dedicated 20A (or higher) breaker (per manual). Keep the cord and wiring away from heat sources and do not route under rugs.
Size-by-size guidance (recommendations)
Every Orion Slim model features HelioVision virtual flame technology with a shallow-depth design for flexible installation.
Why choose the Orion Slim series?
- Shallow-depth versatility: designed for 2×6 wall framing or simple wall-mounting for flexibility in existing homes.
- Premium HelioVision technology: consistent flame image quality across viewing angles.
- Standard power convenience: 120V operation with 5,000 BTUs of supplemental heat—no high-voltage wiring required.
- Modern aesthetics: “Slide-In” clean face design for a minimalist, high-end look.
52" model
OR52-SLIM
Best for: Bedrooms, small apartments, or offices.
Why: The 52-inch model is the most compact in the series, making it perfect for smaller walls where a full-sized linear fireplace would feel overwhelming. It offers the same premium HelioVision flame technology as larger models but in a footprint that fits comfortably under a 50"–55" TV.
Viewing area: 47-7/8" W × 14-3/8" H
Recessed cutout: 50-3/4" W × 19-1/8" H × 6" min. D
Firebox: 50-1/4" W × 18-3/4" H × 5-3/4" D
60" model
OR60-SLIM
Best for: Standard living rooms and primary suites.
Why: The 60-inch is the "Goldilocks" size of the Slim series. It provides a substantial 14-inch high viewing area that feels expansive without requiring a massive wall. It is the most popular choice for mounting under 65" televisions to create a balanced, symmetrical look.
Viewing area: 55-1/2" W × 14-3/8" H
Recessed cutout: 58-1/2" W × 19-1/8" H × 6" min. D
Firebox: 58" W × 18-3/4" H × 5-3/4" D
76" model
OR76-SLIM
Best for: Large living areas, open-concept basements, and commercial lobbies.
Why: At over 6 feet wide, the 76-inch model creates a "wall-to-wall" luxury feel. It is ideal for feature walls where the fireplace is the primary focal point. Despite its impressive width, it still only requires 6 inches of depth, allowing for a grand statement even in rooms with limited floor space.
Viewing area: 72-3/16" W × 14-3/8" H
Recessed cutout: 75-1/8" W × 19-1/8" H × 6" min. D
Firebox: 74-5/8" W × 18-3/4" H × 5-3/4" D
100" model
OR100-SLIM
Best for: High-end custom homes and expansive hospitality venues.
Why: The 100-inch model is a showstopper designed for maximum visual impact. It stretches across the wall to provide a truly immersive experience with three different flame styles and 18 color combinations. It is the ultimate choice for those wanting to anchor a large room with a high-performance, modern aesthetic.
Viewing area: 96-7/16" W × 14-3/8" H
Recessed cutout: 99-1/2" W × 19-1/8" H × 6" min. D
Firebox: 98-7/8" W × 18-3/4" H × 5-3/4" D
View product page and availability
Check current stock, select a size, and see current pricing on the main product page.
Safety and electrical notes are summarized from the Modern Flames Orion Slim owner’s manual. Always follow the manufacturer installation instructions and local electrical code. Use a qualified electrician for hardwire installation.