Answer :

As we know that warm air is lighter than cool air and the warm air rises up and has low pressure , so the exhaust fan of ‘B’ will be more efficient in throwing out the warm air and exhaust fan of ‘A’ will not be more efficient because it has exhaust fan placed on a window and hence the atmosphere will try to maintain balance by giving some air at that warm part and hence the resistance will be more in case of ‘A’ also because in ‘B’ it is more high.

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