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11.12.3 E
XAMPLE
Example C (B23, B23P)
water heater type →
Diameter air pipe
Diameter flue pipe
Diam. roof terminal
Maximum pipe length
[m]
includes:
2 bends 90°
2 bends 45° flue outlet zeta = 1.0
C: S
. A
INGLE FLUE GAS OUTLET
IR SUPPLY FROM WATER HEATER ROOM
Calculation example with given lengths: checking resistance.
Water heater type:
Diameter: 100 mm
Straight tube m¹
Bend
Bend
Flue outlet
Total resistance flue gas:
The total resistance is less than 200 Pa.
This flue gas / air supply system is functional.
NOTE: specific resistance values are used in this example.
Flue and air pipes of other suppliers can have other values
AIR INLET
EFW 85
EFW 105
[mm]
100
100
[mm]
100
100
[mm]
100
100
55.7
34.4
E93.1804.014
EFW 105
Number
total
13
45°
2
90°
2
zeta = 1.0
1
FLUE OUTLET
VENTED AREA
AIR INLET
EXAMPLE: C
B23
EFW 125
EFW 155
100
150
100
150
100
150
17.7
138.2
Pa
Pa total
4.0
52.0
9.0
18.0
14.5
29.0
15.3
15.3
114.3 Pa
57
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