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Surface coefficients to calculate friction and major pressure loss in ventilation ducts - concrete, galvanized steel, corroded steel and more
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| Surface | Roughness - ε | |
| millimeters | feet | |
| Copper, Lead, Brass, Aluminum (new) | 0.001 - 0.002 | 3.33 - 6.7 10-6 |
| PVC and Plastic Pipes | 0.0015 - 0.007 | 0.5 - 2.33 10-5 |
| Stainless steel | 0.015 | 5 10-5 |
| Steel commercial pipe | 0.045 - 0.09 | 1.5 - 3 10-4 |
| Stretched steel | 0.015 | 5 10-5 |
| Weld steel | 0.045 | 1.5 10-4 |
| Galvanized steel | 0.15 | 5 10-4 |
| Rusted steel (corrosion) | 0.15 - 4 | 5 - 133 10-4 |
| New cast iron | 0.25 - 0.8 | 8 - 27 10-4 |
| Worn cast iron | 0.8 - 1.5 | 2.7 - 5 10-3 |
| Rusty cast iron | 1.5 - 2.5 | 5 - 8.3 10-3 |
| Sheet or asphalted cast iron | 0.01 - 0.015 | 3.33 - 5 10-5 |
| Smoothed cement | 0.3 | 1 10-3 |
| Ordinary concrete | 0.3 - 1 | 1 - 3.33 10-3 |
| Coarse concrete | 0.3 - 5 | 1 - 16.7 10-3 |
| Well planed wood | 0.18 - 0,9 | 6 - 30 10-4 |
| Ordinary wood | 5 | 16.7 10-3 |
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