PVC venetian blinds or shutters are the recommended option for wet areas such as bathrooms or if directly installed above kitchen sinks where steam may condense on them.
PVC blinds can of course also be installed in every other window of the house.
The spacing between ladders is slightly less than for timber blinds to allow extra support ladders to be fitted. As PVC becomes less rigid when very warm, this helps keep the slats straight in these conditions.
It is not recommended to install dark colour PVC blinds in windows exposed to the hottest sun in summer. Extreme heat inside the glass will cause distortion of slats and may damage these blinds.