Lennox ML193UH110XE48C - Page 29

Page 29
TABLE 15
Maximum Allowable Exhaust Vent Pipe Length (in ft.) Without Insulation In Unconditioned Space For
Winter Design Temperatures Single - Stage High E󰀩ciency Furnace
Winter Design
Temperatures1 °F
(°C)
Vent Pipe
Diameter
Unit Input Size
    



2
PP

2
PP

2
PP

2
PP

2
PP

 
       
2 in   31     
 13       
3 in 9 9      


        
2 in 9    32 29  
   13     
3 in 1 1   19 19  


        
2 in  3 12  22 19  
 1      22 
3 in   2 2    
1

2





Conditioned
Space
Unconditioned
Space
Exhaust
Pipe
Intake
Pipe
Conditioned
Space
Pipe Insulation
FIGURE 31