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Electric chain hoists usually have a unique and optimal structure, and the most suitable lifting height is 3-12 meters. If the lift is too high, it will cause the chain to malfunction. Single chain is configured for less than 5 tons, double chain is configured for more than 5 tons, and 3 chains are configured for more than 7 tons.
link:https://www.kinocranes.sg/electric-hoist/electric-hoist-by-capacity/6-ton-chain-hoist.html
6 Ton Chain Hoist | Kenancranes