RAIS RONDO Instructions For Installation, Use And Maintenance Manual page 13

Remove the casing knock­out.
Remove the protective cover / seal and place over the
hole in the top ­ make sure that the seal is positioned
properly. Tighten the assembly using the three M6 nuts.
The flue outlet spigot, which can be found in the stove in a
bag, and the holder for the upper flue diverter are
assembled with 3 M6 x 20 nuts and bolts.
The upper flue diverter, baffle plate and top plate are
assembled in reverse order.