Quiet 'zip' sound from fan?

Hi there,
I recently bought the new 2013 macbook air 13" version. It's a great machine and I'm really enjoying it. However, when I wake the MBA from sleep, it makes a 'zip' sound - it's very quiet. I already returned the first one because of this issue and now the new one does the same. Other people have had the same issue - and it could be normal (I'm just a little OCD about these things) - but I would just like some clarification.
Thanks in advance

This is pone of those situations where one must behold the issue to comment on it.
I would say it is bizzarre that two sucessive units would have the same problem such as this, and it being related to an actual flaw.
I would suppose that there exists the strong possibility that your last supposition is indeeed true. What you may be hearing is simply the fan "whirring" up to speed, albiet it is very faint", and your OCD is setting you off.
When you returned the other unit, did the dealer verify the problem, or just take your word for it, no questions asked?

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I figure it may be the fan revving up for use. But I don't know why it would make this kind of noise.
This is the sound that I'm hearing:
https://www.dropbox.com/s/mrsxs8n23whywlh/Voice00002.3gp
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Quiet 'zip' sound from fan?

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