• Fix a metal (exible) tube to the collar using the hose clamp or Parker
screws.
• Insert a pipe (Ø125 mm) between the (exible) pipe and the external air
supply opening in the wall with, if required, a movable damper, in such a way
that the pipe with operating lever is tted so that the damper can be opened
and shut from the living area.
Check that everything works correctly.
• Fit a grate to the outside wall.
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