surface duct
100
8
30
40
40                                                                                
3000.0                       
5                                                                          
400 
0.5                       
40
70                      
7
0.00     1560.00  1.0   0.0 
50.00    1555.00  1.0   0.0
100.00   1530.00  1.0   0.0 
200.00   1525.00  1.0   0.0 
250.00   1520.00  1.0   0.0 
300.00   1510.00  1.0   0.0 
400.00   1500.00  1.0   0.0