My bp also does this when I vacuum, although she usually just pokes her head out. I think they're probably just feeling the vibrations from the vacuum and checking out what's going on, if I had to guess.
I'm not sure how similar the vibrations from a vacuum would be to a blow dryer to a bp - they don't have external eardrums, so they hear much differently than we do. Some people think they can only feel vibrations, and some think it's more like how we hear underwater. Your guess that he's associating it with the sound of a blow dryer for some reason might be right, for all we know.
Have you noticed him doing any defensive behaviors when you're vacuuming? If not, I think it's a safe bet he's just curious about the vibrations and wants to check it out!
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