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Table II
Effective duct
length (m)
Internal diameter or
edge length (mm)
0-20
20-30
30-43
43-60
100
110
120
130
Flexible ducting has been used for the
following example.
Example:
Exhaust connection, left . . . . . . . 6.0 m
Length (L) . . . . . . . . . . . . . . . . . . 0.6 m
Lower radius (R = 400 mm) . . . . 0.4 m
Height (H) . . . . . . . . . . . . . . . . . . 1.5 m
Upper radius (R) . . . . . . . . . . . . . 0.5 m
Wall pipe with louvred vent . . . . . 3.8 m
Effective duct length . . . . . . . . .
12.8 m
Result:
A duct diameter of 100 mm is adequ-
ate since the effective length is less
than 20 m as specified in Table II.
Installation - venting
25