Presumably, the more you put your foot down, the faster the car goes, so the air being drawn into the ventilation system will increase. That part sounds completely normal, but if it happens when you're not driving along, then there's something amiss.
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2008 XC70 3.2 SE Lux with LPG conversion - current
2005 XC70 D5 SE Lux - sold
2004 XC70 D5 SE Lux - written off by another XC70
2001 V70 D5 - sold
2000 V70 Classic 2.4 - sold
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