overall size 450mm.
more info                              
32mm Equal Elbow more info                                   
poly elbow 19mm
more info                                  
kk39
more info                                             
overall size 600mm.
more info                              
25mm 45 Deg Elbow more info                                  
pvc elbow 45 deg 40mm
more info                            
Wall Hung Duct Elbow 110mm more info                         
32mm 45 Deg Elbow more info