Which of the following door types provides the best combination of ventilation and privacy?

Concept:

The different types of doors are as follows:

For wire gauge doors:

In these doors wires are gauged into the frame of the doors to make a mesh of wires which provide free air circulation through the doors but prevents flies, mosquitos and insects from entering inside, there is no privacy.

For Louvered doors:

These are used when privacy with natural ventilation and quietness for rest is desired, as they has a fixed or movable wooden louvers which permit open ventilation while preserving the privacy. These are mostly used in bathroom, water closets, in residential and public buildings where good ventilation is desired.

Partly panelled and partly glazed doors:

These doors are divided into several parts and some of the parts are glazed by laminated glass or any other glazing materials. These kind of doors cannot provide air circulation but sunlight can enter and privacy in dependent upon the glazing materials.

Flush doors:

These are simple door designs that have plain facings on both sides.  Flush doors may have a solid, hollow or stave core. They preserve full privacy but no air circulation and sunlight can be allowed.

∴ Louvered doors can allow air circulation and privacy, even when it is closed.