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 0.147"
Destination 2.3
Middle front ► 30 holes of 0.136''
Middle rear ► 20 holes of 0.128''
Rear ► 15 holes of 0.128''
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Destination 2.3 Installation and Operation Manual