Ferroli OPTIMAX 25 S Instructions For Use, Installation And Maintenance page 17

Optimax 25 S
The total length in equivalent metres of the concentric fl ue must not exceed the maximum lengths stated
in the following table, note that each bend gives rise to the stated reduction. For example, a duct =
60/100 composed of 1 bend of 90° +1 horizontal metre + 2 bends of 45° + 1 horizontal metre has a
total equivalent length of 4 metres.
Vertical fl ueing
The installation of a concentric vertical fl ue can be carried out as follows,
Install the appliance as previously mentioned in this manual.
1. Connect onto the fl ue assembly at the top of the appliance a concentric vertical adaptor part number
1KWMA71W,
2. Use the required amount of 1mtr fl ue extensions (part number 1KWMA56U) inserting them spigot
down ensuring the seals are well lubricated with silicone grease (not supplied) and correctly located
into the sockets.
3. If required 45° bends (Part number1KWMA64A)
may be used with a resistance value of 0.5mtrs
each, the fl ue should be routed in such away
to avoid any unnecessary deviation and thus
minimise the amount of bends required.
4. The termination should be made through
our concentric flue outlet (part number
1KWMA83U) in conjunction with a roof slate
pitched (part number 1KWMA82U)or fl at roof
(part number 1KWMA81U) The storm collar
must be fi xed on using the three screws provi-
ded and sealed with an external grade silicone
(not supplied).
5. For longer fl ue lengths a 125mm concentric
fl ue system is available.
6. All fl ue installations must comply with BS5440
part 1 and must only be of Fèrroli manufacture.
The vertical fl ue must continually rise and be
supported throughout its length. The fl ue
must be inspected whilst commissioning the
appliance to ensure it is sound throughout its
length.
This information is for guidance purposes and
Fèrroli will in no way be held responsible for
incorrect installation following this guide.
Table 2a
Maximum permissible
duct length (Horizontal)
Maximum permissible
duct length (Vertical)
Table 2b
Reduction factors for bends
Vertical Outlet
Angled roof tile
Ø mm Ø mm
60/100 80/125
5 m* 15 m
6 m* 16 m
1 m
0,5 m
0,5 m
0,25 m
Roof end piece
1KWMA83U
1KWMA82U
1KWMA56U
215 185
1KWMA71W
fi g. 10c
17