1. Extended surfaces (see also Fins)
1. operational principles of, 2.4.9-1 - 2.4.9-3
2. types of, 2.4.9-3 - 2.4.9-5
1. high radial fins, 2.4.9-4 - 2.4.9-5
2. longitudinal straight fins, 2.4.9-3
3. low radial fins, 2.4.9-3 - 2.4.9-4