A component in a ventilation system.
A pastry with the upper side sliced before final baking to resemble a wooden slatted blind.
Upward sloping window slats which form a blind or shutter, allowing light and air in but excluding rain and direct sun.
A type of electron tube that controls electron current through vacuum between electrodes within a sealed container, usually of glass or metal and often designed to be easily installed in and removed from the equipment in which it is used.