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