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The minimum slope of these ducts towards the outside must be 1 cm
per metre in length.
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Adding a 90° bend shortens the total length by 1 metre.
Adding a 45° bend shortens the total length by 0.5 metres.
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L max = 4 m
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(L
1
+L
2
) max = 3 m
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examples of installation with horizontal ducts
MINIMUM SLOPE 1 cm per metre (down towards
the outside to drain off condensation)
(L
1
+L
2
) max = 3 m
(L
1
+L
2
+L
3
) max = 3 m
view from above
view from above
view from above
view from
above