IDEAL imax W45 Installation And Servicing Manual page 18

21 EXAMPLES OF CALCULATING FLUE RESISTANCES/LENGTHS - EXAMPLE 2
Example 2
Flue size
Vertical flue kit 80/125
2 x 1m extension flue
2 x 45º elbow
Total flue resistance
The total maximum flue resistance for an
80/125. Therefore this installation is acceptable.
22 EXAMPLES OF CALCULATING FLUE RESISTANCES/LENGTHS - EXAMPLE 3
18
INSTALLATION
Vertical Roof flue for
Resistance (Pa) Resistance (m)
80/125 80/125
62 6.2
2 x (10) 2 x (1)
2 x (11) 2 x (1.1)
104 10.4
W60 is 140Pa or 11m
Example 3
Flue size
5 x 1m extension
2 x 45º elbow
Total flue resistance
The maximum flue extension for an
Therefore this installation is acceptable.
W60
Horizontal flue for
Resistance (m)
W80 on open flue is 29m.
W80
100
5 x (1)
2 x (1.8)
8.6
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Installation & Servicing