Mason-Lite 43" Standard See-Through Wood Burning or Gas Firebox Kit - MFPST43
Create a stunning focal point with the Mason-Lite 43" See-Thru Firebox Kit (MFPST43) a premium double-sided masonry fireplace designed for both indoor and outdoor living spaces. Engineered for versatility, this high-performance firebox supports wood burning or decorative gas log installations, allowing you to enjoy warmth and ambiance from two adjoining areas at once.
Constructed with lightweight, high-strength modular concrete, the MFPST43 delivers the classic look of a traditional masonry fireplace while significantly reducing installation time and labor costs. Its innovative see-through design enhances open-concept layouts, patios, and shared living spaces, making it a top choice for homeowners, builders, and designers.
This UL-listed fireplace system is built to meet strict safety and performance standards and is compatible with a 16" UL103 Class A chimney system. With a durable design, customizable finishes, and optional firebrick liners, the Mason-Lite MFPST43 offers both beauty and long-term reliability.
Features
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43" See-Through Fireplace Design – Enjoy a dual-sided viewing experience, perfect for indoor/outdoor or multi-room installations
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Wood Burning or Gas Log Compatible – Designed for solid wood logs or plumbed gas log sets (ANSI compliant)
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Lightweight Modular Masonry System – High-strength construction (~3500 PSI) reduces installation time to just a few hours
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Complete Firebox Kit Included – Comes with mortar, rebar, and steel lintel (T-bar) for easy assembly
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UL & ULC Listed for Safety – Meets UL127 standards for factory-built masonry fireplaces
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Indoor & Outdoor Installation – Ideal for patios, living rooms, and open-concept spaces
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Customizable Interior Finishes – Optional herringbone or running bond firebrick liners available
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Efficient Airflow Design – Supports outside combustion air kits for improved performance
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Glass Door Compatible – Tested and approved for use with listed glass doors
Specifications
| Specification |
Details |
| Model |
MFPST43 |
| Fireplace Type |
See-Through Masonry Firebox |
| Fuel Type |
Wood Burning or Decorative Gas Logs |
| Framing Width |
57" |
| Framing Height |
64 1/4" |
| Framing Depth |
28" |
| Floor Area |
10.3 sq. ft. |
| Fireplace Weight |
Approx. 1,399 lbs |
| Flue Size |
16" UL103 Class A Chimney |
| Chimney Height |
Min. 14 ft / Max. 40 ft |
| Clearance to Combustibles |
2" sides, rear, and front |
| Certifications |
UL127 & ULC610 Listed |
| Installation |
Indoor / Outdoor |
Resources
