36
8.8.7
E
XAMPLE
D2:
T
WIN PIPE SYSTEM WITH CONCENTRIC ROOF TERMINAL
.
Boiler type:
S-CB
+
400
Flue gas
Diameter: 200 mm.
Number
Pa
Pa total
Straight tube m¹
total
4
1,8
7,2
Bend
90°
1
6,5
6,5
Adapter eccentric
1
0,9
0,9
Condensate trap
1
3,7
3,7
Conc. roof terminal 200-300 M&G
1
56,5
56,5
Total resistance flue gas outlet:
74,8
A
ir
su
pp
ly
Diameter: 200 mm.
Number
Pa
Pa total
Straight tube m¹
total
2.5
1,3
3,25
Bend
90°
2
4,9
9,8
Adapter 180-200
1
4,3
4,3
Conc. roof terminal 200-300 M&G
1
28,6
28,6
Total resistance air supply:
45,95
Total resistance flue gas outlet and air supply:
120,75
The total resistance is less than 250 Pa, so this is acceptable.
(The maximum allowed pressure is increased to 250 Pa when using a concentric roof terminal).
1.0 m
3
.0
m
2
.5
m
2
2
6
0
7
0
0
4
8
0
Excentric adapter 180>200 mm
Excentric so there is no water
agglomeration.
Besides using an 160>180
mm adapter use also an
180>200 mm adapter.
INLET AIR MUST BE CLEAN
AND FREE OF WATER.
ALWAYS USE A WIRE MESH
TO PREVENT DEBRIS
BEING DRAWN INTO THE
AIR INLET.
The example calculation is
only valid using the
concentric roof terminal
