These can easily be installed with Thermacell as follows:
- Scribe out the curve/shape in an unfilled Thermacell wall.
- Cut out the shape using a keyhole saw.
- Cover the cut-out section with a thin piece of flat steel.
- Replace the section in the wall (to support the steel) and fill with concrete
- 24 hours later, remove the cut out section & finish with plaster sheet.