25
Instruction for the installer
FLUE CONFIGURATION
Ø 60 mm
The maximum allowed pressure drop, apart from the
installation type, cannot be higher than 60 Pa.
CALCULATION OF THE PRESSURE LOSSES
OF THE COMBUSTION AIR INLET/PRODUCTS
OUTLET DUCTS
When calculating the pressure losses bear in mind the
following parameters:
- For the twin flue pipe system’s adaptor, the pressure loss is
of 4 Pa;
- For reducer M Ø80 / F Ø60 the pressure drop is 6 Pa in
evacuation and 3 Pa in suction
- For reducer F Ø80 / M Ø60 the pressure drop is 6 Pa in
evacuation and 3 Pa in suction
- For each large radius 90° bend Ø 60 (R=D), the pressure
loss is of 4 Pa;
- For each metre of Ø 60 flue pipe the pressure loss is of 3 Pa
in the combustion air inlet;
For each metre of Ø 60 flue pipe the pressure loss is of 5 Pa
in the combustion product outlet;
- For the Ø 60 L=1 horizontal combustion air inlet terminal
the pressure loss is of 6 Pa;
- For the Ø 60 L=1 horizontal combustion products outlet
terminal the pressure loss is of 10 Pa;
- For the vertical flue outlet duct Ø 80 L=1 the pressure loss
is of 8 Pa
Note: These values refer to flue systems made
with original UNICAL non flexible and smooth
pipes.
00361435
00360360
00360351
00360352
00360353
00360355
00360353
00360354
00360351
00361435
00360360
00360351
00360355
00360352
00360353
00360356
KIT5790C
The maximum pressure drop of 60 Pa
includes the losses created by:
1 adapter from
1 x Ø60/100 mm to 2 x Ø80
mm
2 wide radius
1 exhaust te
1 air intake te
2 reducer M Ø80 / F Ø60
Example N.1
Intake of primary air from the perimeter
wall and flue outlet from the roof.
Example N.2
Intake of primary air and flue outlet from two external perimeter
walls.
It is not permitted to position the two terminals on opposite
walls.
