Osburn Stoves by SB I 2200 ユーザーズマニュアル

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5. 
Note that any tube can be replaced without disturbing the baffle. 
 
Important Notes: 
The air tubes are identified for placement as follows: 
Front to back: 
   Tube No. 1  67 Holes   of   .156” diameter 
Tube No. 2  67 Holes   of   .140” diameter 
Tube No. 3  67 Holes   of   .140” diameter 
Tube No. 4  67 Holes   of   .125” diameter 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Figure 3.4 – Secondary Air Tube replacement