Baxi LUNA3 SYSTEM HT 1.180 MP Installers And Users Instructions page 51

A 90° bend reduces the total duct length by 0.5 metre.
A 45° bend reduces the total duct length by 0.25 metre.
14.4 separateD horIzontal flue termInals InstallatIon optIons
IMportant -
Ensure a minimum downward slope of 1 cm toward the outside per each metre of duct length
Make sure that the exhaust and intake ducts are securely fixed to the walls.
L max = 15 m
InstructIons pertaInInG to the InstaLLer
(L1 + L2) max = 80 m
The maximum length of the suction
duct must be 15 metres.
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925.916.2 - GB