A. Attach the template to the wall using masking tape. Use a spirit
level to ensure that it is perfectly level.
B. Drill the fixing holes shown in black, and insert wall plugs.
C. Using a 135 mm core drill, drill the two air intake holes. These
should be drilled with a downwards slope
of between 3° and 5° to make sure that
any water will drain out.
D. Using a 30 mm masonry bit, or a core
drill, drill the hole for the water drain. This
MUST have a downward slope of between
3° and 5° to make sure that the water will drain out.
E. Install the grilles into the air intake and exhaust tubes.
F. Cut the air intake and exhaust tubes so that they are 10 mm
less then the thickness of the wall.
G. Attach the flanges for the air intake and exhaust tubes to the
tubes using the 10 mm screws provided.
H. Then fix the tube/flange assembly into the hole. If the outside
wall is accessible, fill the area between the tubes and the wall
using expanding foam, and attach the rubber rings to the outside of
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