The plural of "gjennomgangsrom med to dører" is probably the meaning of "sluser" here. Though in some contexts, I suppose "nødsluser" could let water out of a room in an emergency.
I really don't mean to be snarky, and I apologise if you already know about it, but I think you would find the online Bokmålsordboka very useful: Bokmålsordboka | Nynorskordboka