Overlapping and sloping slats arranged to prevent entrance or exit of some substances but allow ventilation air to pass.

Vents or horizontal slats covering an opening which admit air but no light.

Sloping slats, which are arranged at a downward angle, in close proximity but not touching, so there are openings between them. They are primarily used to admit light and air to provide ventilation without allowing rain to enter. Louvers can be made of wood, aluminum, galvanized steel or glass panes for louvered windows.

Vent flaps or vanes that either restrict or allow air flow.

An open vent cover

These are the vertical strips of fabric that make up a Vertical blind.

Horizontal components of a panel which can be tilted for light control or fixed for privacy concerns

In door construction, openings fitted with metal or wood louver panels.

A screen of numerous baffles. (See Baffles).