Which of the following statements is correct about the forced-draught fan used in steam boilers? 

1
The power required by an induced-draught fan is equal to that required by a forced-draught fan for the same amount of draught. 
2
The power required by an induced-draught fan is less than that required by a forced-draught fan for the same amount of draught. 
3
The power required by an induced-draught fan is greater than that required by a forced-draught fan for the same amount of draught. 
4
The power required by an induced-draught fan may be greater than or less than that required by a forced-draught fan for the same amount of draught. 

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