Is this normal?

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I've got an s reg Grand Move 1.5 automatic. I love it to bits, it does everything I want it to.
I've noticed that at 2800rpm to 3300rpm I can hear a whistling sound, it only starts and stops at this rev band. It may have been there all along (I've had the car for 6 months) but only just noticed it because of driving with the window open now that it is summer. It sounds very much like air being sucked through a restiction. Should it be like that? I would appreciate any comments.
Many thanks.

Whistling

Have you checked the air filter? Take it out and check for debris, leaves etc, give it a shake or hoover to clean out the element.
Other than that, maybe it's just happy!
Russ.

Russ.