Magnum Fire Chest – Video and FAQ


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Do I use lip glue to bed the base slab?

No, you can bed the base slab on mortar which will help to level it.

How much lip glue do I use?

Lip glue should be applied using the application bags provided, you should create 20-25mm beads of glue and apply as per the video instructions. The finished joint should be 2-3mm thick.

Do I need to glue the firechest to a back wall?

No, the firechest can be built against a wall but not glued to it.

How do I fix the damper in place?

The damper should not be fixed or bedded in place to allow for expansion, its weight will hold it in place.

Can I use the damper to control the fire?

No, The damper is there to close the flue off when not in use to save on heat lose, it must be opened before lighting.

Can I put timber against the firechest?

The firechest must have 100mm of masonry to each side and behind the back of the firechest. You can finish the front with plasterboard on dabs or render using mesh.

What distance do I need to combustible materials?

Timber can go against the surrounding 100mm of masonry, 40mm is required from the front face of the gather to timber, A wooden fireplace surround can go against the face of the firechest.

How do I finish the inside of the firechest?

You will need firebrick slips, these are 50mm thick for the back and base and 25mm thick for the sides.

How do I fix the Firebricks?

They should be glued on using the Firebrick Mortar and then pointed in, the base bricks should be laid loose, the front row can be glued in.

What combustion air is required?

We state in our instructions and brochure how much free air is required for combustion for each model.

Can I put the combustion air inside the firechest?

The free air must be provided to the room via air bricks into the walls, floor or ceiling but cannot be put into the opening.


Connection to an appliance, which is not connected to the fuel supply, may be carried out by a competent person. However, connection to an appliance, which is connected to the fuel supply, must be carried out by a GAS SAFE (gas) or OFTEC (oil) registered installer.

Schiedel Chimney Systems Ltd. recommends the use of HETAS registered installers for solid fuel applications.

This installation assistant is to be used as a visual aide only, by qualified installers, in conjunction with the detailed component installation instructions. For full design and installation details, the key referral documents are as follows:-

  • BS EN 13229: Inset appliances including open fires fired by solid fuels. Requirements and test methods.
  • BS EN 1858: Chimneys. Components. Concrete flue blocks.
  • BS EN 1443: Chimneys – General Requirements
  • BS EN 15287-1: Chimneys. Design, installation and commissioning of Chimneys for non-roomsealed heating appliances.
  • BS EN 5440-1: Flueing and ventilation for gas appliances of rated input not exceeding 70kW net (1st, 2nd and 3rd family gases). Specification for installation of gas appliances to chimneys and for maintenance of chimneys.
  • Approved Document J: Combustion appliances and fuel storage systems (England and Wales)
  • DFP Technical Booklet L:- Combustion appliances and fuel storage systems (Northern Ireland)
  • Technical Handbook (Domestic & Non Domestic), Section 3 – Environment (Scotland)
  • Appliance Installation Instructions and related standards. Other standards covering specific applications will also be relevant and should be adhered to.

Planning permission may be required and reference should be made to the local Building Control Department.

Ensure all chimney components are available and check them to ensure there has been no damage.

Do not use damaged components. Build the chimney up to follow the previously designed route, which should be as straight as possible.