11. Carefully install the glass tube by lifting it and inserting it through the center hole
in the upper plate. Ensure the black silicone ring is attached to the lower edge of
the glass tube as illustrated. Slide the glass tube through the hole of the lower
plate cover and onto the middle plate. Check and ensure that the glass tube is
positioned properly and is completely covering the center hole of the middle
plate.
WARNING! The black silicone ring must be in place prior to operating the
heater.
12. Assemble the protective guards. Hang the hooks of each protective guard on
holes of upper supports.