On Sun, 5 Jul 2015 20:17:54 -0700 (PDT), wrote:

My window fan just sparked up right now a few times and made popping noises! Freaked me right out and it is brand new and doesn't have any dust on it!

No more dangerous than any motor, most of which will last for years if
not decades and fail without causing a problem.

TAke it back and get another one or another brand.

I"m using my father's fan now that he bought around 1955. Old ones
have to be oiled every year or two but it still works fine.