Chaffoteaux MIRA SYSTEM 30 FF [7/20] Concentric twin flow

ø 100

60 mm

In the special case where the connection

is with separate tubes and with the boiler

installed at a minimum distance of 6 cm

from the wall, make a 10 cm ø hole, thus

enabling better assembly between the

fresh air elbow and the tube outside the

wall (see diagram).

L = total length of air intake and burnt gas exhaust ducts.

If the burnt gas flue length is over 5.5 m, install a condensate trap.

The maximum development value L, mentioned in the table includes the exhaust gas/fresh air terminal and for the coaxial

system also takes into account an elbow. The C52 outlets should respect the following instructions:

1- Keep the same 80 mm ø for the gas intakes and exhaust gas ducts.

2- If you need to insert elbows in the gas intake and exhaust gas ducts, you should consider for each one the equivalent length

to be included in the calculation of developed length.

3- The exhaust gas duct should jut above the roof by at least 0.5 m.

4- The intake and exhaust gas ducts in C52 cannot be installed on opposite walls of the building.

Diagrams illustrating some typical coaxial and twin flow

installations.

For more detailed information concerning exhaust gas ducts and

fresh air intakes, consult our accessory catalogues.

Warning

If the selected exhaust gas duct is planned

to be fitted with a restrictor as indicated in

the corresponding tables, then the

installation of the restrictor is compulsory.

5.3 FITTING THE RESTRICTOR

Concentric

twin flow

24 kW twin flow outlet Ø 41 Restrictor Ø 45 Restrictor Without Restrictor

C12, C32, C42 80/80 L = 0 to 5.5 m L = 5.5 to 21 m L = 21 to 33 m

C52, C82 80/80

Fresh air intake length 1 m.

L = 0 to 9 m L = 9 to 43 m L = 43 to 67 m

30 kW twin flow outlet Restrictor ø 45 Without Restrictor

C12, C32, C42 80/80 L = 0 to 5,5 m L = 5,5 to 20 m

C52, C82 80/80

Fresh air intake length 1 m.

L = 0 to 17 m L = 17 to 43 m