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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 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    













Conditioned

Space

Unconditioned

Space

Exhaust

Pipe

Intake

Pipe

Conditioned

Space