Mason-Lite 39" Standard Wood Burning or Gas Firebox Kit - MFP39
The Mason-Lite 39" Standard Wood Burning or Gas Firebox Kit (MFP39) is a premium, factory-engineered masonry firebox designed for both wood-burning fireplaces and compatible gas log applications. Built with high-performance precast refractory materials, this firebox delivers the timeless look of traditional masonry while offering a lighter, faster, and easier installation system.
Ideal for both indoor and outdoor fireplace construction, the MFP39 provides exceptional structural strength, thermal efficiency, and design flexibility. It is engineered to meet UL 127 safety standards and works with a UL 103 Class A chimney system, making it a trusted choice for residential fireplace projects. With its modular design, the MFP39 is suitable for multi-story installations and can be integrated into a wide range of architectural styles from rustic to contemporary.
Whether you're building a new fireplace or upgrading an existing structure, the Mason-Lite MFP39 delivers reliable performance, superior heat retention, and long-lasting durability for years of enjoyment.
Features
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Versatile Fuel Compatibility – Designed for wood-burning use and adaptable for approved gas log systems
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Lightweight Masonry Construction – Up to 50% lighter than traditional site-built masonry fireplaces
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UL Certified Safety Design – Tested to meet UL 127 standards for factory-built fireplaces
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High Thermal Performance – Excellent heat retention and structural strength for long-term use
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Modular Installation System – Precast components allow faster and more efficient assembly
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Indoor & Outdoor Approved – Suitable for interior living spaces or exterior fireplace builds
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Multi-Story Installation Rated – Approved for combustible floor and multi-level applications
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Firebrick Liner Options – Compatible with various firebrick patterns for customized aesthetics
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Durable Precast Material – Engineered for long-lasting performance and weather resistance
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Compatible Chimney System – Designed for use with UL 103 Class A metal chimney systems
Specifications
| Specification |
Details |
| Model |
MFP39 |
| Fireplace Opening |
39 inches (nominal class size) |
| Fuel Type |
Wood-burning / Gas log compatible |
| Construction |
Precast refractory masonry panels |
| Chimney Requirement |
UL 103 Class A metal chimney |
| Certification |
UL 127 listed |
| Installation Type |
Indoor / Outdoor |
| Application |
Residential masonry fireplace system |
| Weight |
Lightweight precast design (varies by configuration) |
| Heat Use |
Supplemental heating only |
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