Can you have glass surrounding it or does it need to be open? I want to build it into a room divider but would prefer glass either side.

Thanks for your enquiry.

Yes, you can build a Dimplex Opti-Myst cassette fire so it acts as a divider between rooms. Glass on both sides is possible, but you'd need to follow the manufacturer's guidelines to ensure proper ventilation requirements are met. Your main considerations are ventilation (air intake) and condensation control.