Re: Bosch WVT1260
to my knowledge you are not going to stop all steam escaping from any washer dryer
am assuming its a cold kitchen so steam is more visable
but if you look at the mechanics all are a closed circuit air goes round in a circle. if any escapes then more air has to go in otherwise you would get a vacuum. since i assume there is no way the air can get in other than the way it is getting out then then the drum is breathing
i would talk to bosch customer services as if you are an owner see whet they say
hope this helps
Dave