Our pressure vent is directly above our bed and our Aldi fan hooks on to this, we dislike any noise at night but we have had one of these fans now for several years and consider it worth its weight in gold, on the lowest setting the batteries lasted over two seasons by the river in
Echuca /Moama
I bit the bullet and bought one, I wont be taking it back.
Moves quiet a bit of air even on low and not too noisy.
Has a decent size battery so should go all night