Enerzone Destination 1.6 Installation And Operation Manual page 46

Note that secondary air tubes (B) can be replaced without removing the baffle board (A).
Important Notes:
The air tubes are identified for placement as follows:
Model Type of tube
Front ► 30 holes of 3.55 mm
Destination 1.6
Middle front ► 30 holes of 3.8 mm
Middle rear ► 30 holes of 3.8 mm
Rear ► 20 holes of 3.25 mm
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Destination 1.6 Installation and Operation Manual