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     
       
  
Number of
90° Turns
or Elbows
Rigid Duct Flexible Duct
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 

    
       
   
      
   °   
   
        
   
     
  
      
    
      
    

     
     
      
 
 
      
    
     
   

      
     
     
   
  
  
   

     
     
 
i
      
    
  
  
   

     
     
 
  
   
      
      
   
    


     
   
   
  
       
  
       

      
      
   
  
     
      
      
     
