Table 1.

The designed data to model the ducts.

Model	CR	De	Li	Model	CR	De	Li	Model	CR	De	Li
1	2	16	40	10	4	14.5	36	19	6	13	32.5
2	3	16	40	11	6	14.5	36	20	8	13	32.5
3	4	16	40	12	8	14.5	36	21	10	13	32.5
4	2	16	120	13	4	14.5	109	22	6	13	97.5
5	3	16	120	14	6	14.5	109	23	8	13	97.5
6	4	16	120	15	8	14.5	109	24	10	13	97.5
7	2	16	240	16	4	14.5	220	25	6	13	195
8	3	16	240	17	6	14.5	220	26	8	13	195
9	4	16	240	18	8	14.5	220	27	10	13	195