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There are three types of impeller configuration:
1- Open Type Impeller (nothing but vanes distributed equally around the central hub)
2- Semi-Open Impeller (distributed vanes around central hub with just one covered side and the other is opened)
3- Closed Type Impeller (distributed vanes around central hub with both sides covered)
1-open impeller consists of nothing but vanes attach to central hub
2-open impeller
3-closed impeller