Ferroli DOMIcompact F 24 B Instructions For Use, Installation And Maintenance page 16

Restrictor
This appliance is factory fitted with the correct restrictor for use with a standard 100mm concentric flue
terminal of less than 1mtr.For different flueing applications choose the correct size restrictor from the
tables below. To change the restrictor please follow the instructions below, shown in figure 9.
Determine the correct size of flue restrictor required, before installing the standard concentric flue kit
onto the boiler, check that the restrictor fitted is 50mm diameter and that it is correctly positioned (see
fig. 9).
N.B.: the diameter of the hole is
stamped on the restrictor
Choice of restrictor:
• With the 2 pipe system:
- Calculate the total flow resistance of the
combined air and flue pipes in metres.
- utilise the table shown below to choose
the most suitable restrictor for the flow
resistance calculated (see page 19)
16
DOMIcompact F 24 B
fig. 9
• With concentric systems:
- Choose correct restrictor from table below.
(see page 17 & 18)