Baxi LUNA HT 1.450 Installation And Servicing Instructions page 21

4.1.2 two pipe system
This type of venting allows for exhaust flue and intake flue to be seperated from each other. Fresh air may be drawn in at
a different site from where the flue terminal is located.
The splitting kit consists of a flue duct adaptor (160/110) and of an air intake adaptor.
For the air duct adaptor fit the screws and seals previously removed from the cap.
The 90° bend allows to connect the boiler to flue-air ducting
regardless of direction as it can be rotated by 360°. It can
moreover be used as a supplementary bend to be coupled
with the duct or with a 45° bend.
A 90° bend reduces the total duct length by 1.64 ft / 0.5 m
A 45° bend reduces the total duct length by 0.82 ft / 0.25 m
Flue duct adaptor
Intake air
duct adapter
Fig. 10
Separated horizontal flue terminals installation options
The maximum length of the suction duct (L1) cannot
exceed 32.80 ft / 10.0 m.
WARNING
Ensure aminimum downward slope of 0.39 in for
every 3.28 ft of duct length (1.0 cm toward the
boiler per each metre).
INSTALLATION AND SERVICING INSTRUCTIONS
Fig. 11
Fig. 12
HT 1.450 (L1+L2) max = 164.0 ft / 50.0 m
HT 1.650 (L1+L2) max = 114.8 ft / 35.0 m
21
L1 max = 32.8 ft / 10.0 m
L1 max = 32.8 ft / 10.0 m
L2 max = 65.6 ft / 20.0 m
7110242.02 - en