Table II
Overall duct
length
Internal
diameter
0 - 15 m
15 - 21 m
21 - 34 m
100 mm
110 mm
120 mm
Flexible ducting has been used for the
following example. See Table I for addi-
tional duct length factors for other
types of ducting.
Example:
Side connection. . . . . . . . . . . . . 1.00 m
Length (L) . . . . . . . . . . . . . . . . . 2.50 m
Lower radius R = 400 mm . . . . . 0.50 m
Height (H) . . . . . . . . . . . . . . . . . 2,00 m
Upper radius R = 200 mm . . . . 0.50 m
Wall duct with
louvred vent. . . . . . . . . . . . . . . . 3.60 m
10.10 m
Result:
A duct diameter of 100 mm is adequ-
ate, since the overall length is less than
the 15 metres specified in Table II.
Installation - venting
29
