Enerzone Destination 2.3 Insert Installation And Operation Manual page 53

Note that secondary air tubes (A) can be replaced without removing the baffle board (B).
Important Notes:
The air tubes are identified for placement as follows:
Model Type of tube
Destination 2.3 insert Front ► 30 holes of 0.147"
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 Insert Installation and Operation Manual