Mason-Lite
Mason-Lite 33" Standard Wood Burning or Gas Firebox Kit - MFP33
Mason-Lite 33" Standard Wood Burning or Gas Firebox Kit - MFP33
The Mason-Lite 33" Standard Wood Burning or Gas Firebox Kit (MFP33) is a premium, factory-engineered masonry firebox designed to deliver the authentic look and performance of traditional brick fireplaces with modern efficiency and easier installation. Built for both wood-burning and gas log applications, this 33-inch firebox system offers exceptional durability, versatility, and code-compliant safety for residential and multi-story installations.
Engineered as a lightweight masonry system, the MFP33 reduces structural load while maintaining the strength and thermal performance of conventional site-built fireplaces. It is UL127 tested and designed for use with UL103 Class A chimney systems, ensuring safe venting and long-lasting operation. Ideal for new construction or remodeling projects, this firebox supports a wide range of finishing options, including brick veneer and custom firebrick linings for a high-end architectural fireplace look.
With its proven masonry construction, superior heat resistance, and flexible fuel compatibility, the Mason-Lite MFP33 is a trusted choice for homeowners, builders, and architects seeking a reliable, high-performance fireplace solution.
Features
- Dual Fuel Compatibility – Designed for use with both wood-burning fires and approved gas log sets
- 33-Inch Firebox Opening – Compact size ideal for standard residential fireplace designs
- Lightweight Masonry Construction – Up to 50% lighter than traditional site-built masonry fireplaces
- UL127 Listed Safety Design – Tested for safe operation with proper chimney systems
- UL103 Chimney Compatible – Works with Class A chimney systems for efficient venting
- High Thermal Performance – Engineered for excellent heat retention and durability
- Multi-Story Approved Installation – Suitable for multi-level residential builds
- Combustible Floor Approved (with system components) – Flexible installation options
- Custom Finish Options – Compatible with brick veneer and firebrick liners
- Made in the USA – Manufactured with quality domestic materials
- Professional-Grade Build – Designed for contractors, builders, and fireplace installers
- Optional Accessories Available – Includes gas kits, outside air kits, and framing components
Specifications
| Specification | Details |
|---|---|
| Model | MFP33 |
| Brand | Mason-Lite |
| Firebox Opening (W x H x D) | 30" x 22.5" x 21.5" |
| Overall Unit Height | 54.5" |
| Footprint Dimensions | 37" x 28" |
| Framing Dimensions | 41" W x 30" D x 56.25" H |
| Flue Diameter | 12" (Class A UL103 chimney required) |
| Fuel Type | Wood-burning or approved gas log set |
| Certification | UL127 Listed (Factory-built masonry fireplace) |
| Clearance to Combustibles | 2" (sides & back) |
| Installation Types | Flush, corner, internal wall, full projection |
| Fireplace Weight | Approx. 1,091 lbs |
| Mortar & Rebar Weight | Approx. 60 lbs |
| Ready-Mix Requirement | Approx. 150 lbs |
| Chimney Compatibility | UL103 Class A metal chimney system |
| Floor Compatibility | Suitable for combustible and non-combustible floor systems |
| Heat Rating | Tested up to approx. 1700°F |
| Construction Type | Precast lightweight masonry system |
| Origin | Made in USA |