What is it?

So I was at my house on the computer and I heard a sound like wind blowing. I looked to see what it was and I say something that was about 2 1/2 feet wide and about 4 feet tall and white. Before I could really get a look at it, it dissipated down into the air vent. I checked to make sure that none of the windows were open and none were. Can someone tell me what it is.

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This thread has been moved to Misc Topics from Spiritual Creatures.