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In a note on its support site the company explained that as a result, 'Some MacBook computers may appear to be running too warm, with the fan running consistently and heat emanating from the top and/or the bottom of the computer.'

The cause? A small strip of plastic.

'Some MacBooks may have left the factory with a thin piece of clear plastic covering the rear vent,' Apple says. 'This is used in the factory to prevent dust from getting into your computer. If your MacBook has the plastic still over the vent, simply remove and discard it.'

In separate article Apple noted that if your MacBook does not have the plastic obstruction but still tends to get hot this could fall within expected operating parameters. The note provides information on minimising heat emissions.