Operating instructions
Heatmax Furnace Installation and Operation Manual   
66 
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 
HEATMAX 
Front ► 106 holes of 0.109" 
Middle front ► 53 holes of 0.109’’ 
 Middle rear ► 53 holes of 0.109’’ 
Rear ► 53 holes of 0.109’’ 










