No rain covers. Mine sits outside all the time aswell. As far as I can see the vent is just over the top of the popcharger so I shouldn't really get any issues, If i do then i will put the original intake pipe back on because its longer so will move the filter a bit further away from it
Also just got back from a week away & apparantly its rained here quite a bit so its had a weeks test outside in the rain & it still works