Question about Philips PureProtect Water 3400 Series

Unfortunately, it has to be a room, or at best an adjoining open room, otherwise the effect fizzles out. We have tried it with room partitioning, but it is not usable. Great results in our largest room.

It all depends on how the surface is partitioned, but logically it's more effective in a single room.
That said, I'm very pleased with the performance of this appliance.