Transform your home with the Isokern Magnum Firechest 1200, the perfect solution for creating stunning open fires. Customise the final look with your choice of fireplace surrounds to match your personal style.
Seamless Integration with Isokern Chimney Systems
Designed to complement the Isokern chimney systems, these fire chests ensure a complete, efficient setup, eliminating common issues such as draught problems and smoky fireplaces.
The Magnum Fire Chest Range
The Magnum Fire Chest range is engineered to optimise wood-burning efficiency in open fires. Its uniquely shaped fire chamber enhances the burning of wood logs, achieving efficiencies between 41% and 45%, depending on the selected model. Each fire chest in the range is rigorously tested to meet EN 13229 standards.
Features
- Innovative Design: Crafted from lightweight, highly insulating pumice sourced from the Hekla Volcano in Iceland.
- Easy Assembly: Components interlock like a three-dimensional jigsaw, forming a robust fireplace recess and gather. With lip glue jointing compound sealing the joints, the complete fire chest and gather can be assembled in under an hour.
- Versatile Sizes: Available with fire openings ranging from 500mm to 1250mm wide, each fire chest comes packed on a pallet with detailed assembly instructions.
- Load Bearing Capacity: Capable of supporting up to 2600kg of chimney above. Exceeding this weight is possible with additional lintels.
Technical Specifications
- Damper: The Magnum range includes a flue damper for wood-burning installations. Closing the damper reduces heat loss when the fireplace is not in use, significantly improving energy efficiency as reflected in SAP calculations for Document L. Note: The damper is not suitable for gas fires.
- Flue Sizing: Each fire chest has been tested to determine the optimal flue size for peak performance. Recommended flue sizes are provided in the range table, with a minimum flue height requirement of 4.5m above the fireplace opening.
| SAP Code | Model | Opening Width (mm) | Opening Height (mm) | Ext. Width (mm) | Ext. Height (mm) | Ext. Depth (mm) | Weight (kg) |
| 130773 | 500 | 510 | 540 | 685 | 1540 | 440 | 390 |
| 129371 | 950 | 990 | 960 | 1090 | 1761 | 710 | 715 |
| 129568 | 1100 | 1130 | 960 | 1230 | 1761 | 710 | 790 |
| 129767 | 1200 | 1246 | 960 | 1346 | 1761 | 710 | 845 |
| Magnum 500 Inside Flue diameter 200mm Magnum 950 – 1200 Inside Flue diameter 350mm | |||||||
Downloads
Brochure: 940002642 Isokern Brochure 25-08-23
Installation Manual: Magnum instructions 17-04-23






