Mine ventilation and plumbing: what they have in common

1. Step 1. Mine ventilation — has part — Electric fan. Fans.
2. Step 2. Electric fan — has part — Impeller. A fan's blades are an impeller that pushes the air.
3. Step 3. Impeller — is part of — Centrifugal pump. The impeller accelerates the liquid.
4. Step 4. Centrifugal pump — is part of — Water tower. Filled by pumps.
5. Step 5. Water tower — is part of — Plumbing. Maintaining pressure.

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