Enerzone Solution 3.4 Installation And Operation Manual page 45

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
Front ► 28 holes of 0.203"
Solution 3.4
Middle► 28 holes of 0.172''
Rear ► 28 holes of 0.172''
45
Solution 3.4 Installation and Operation Manual