E.C.A. Proteus Plus Installatio And User's Operating Instructions page 14

If the air/flue kit length is insufficient, additional flue
accessories qualified service. Do not use any other type / brand name of
flue parts.
- Horizontal air/flue kit accessories (fig 11):
a) Concentric extension, L=500 mm, 60/100 mm
Concentric extension, L=1000 mm, 60/100 mm
Concentric elbow, 60/100 mm
0
b) 90
Concentric elbow, 60/100 mm
0
c) 45
a)
fig. 9
Room Sealed Fan Assisted Operation
fig. 10
b)
fig. 11
should be ordered through
c)
13