1) Automobile hood slits 2) Blind parts 3) Blinds with angled slats 4) Overlapping slats 5) Slatted windows 6) Ventilating slits 7) Window slats 1) Slats 
Mechanical devices that control air intake of F.D.and I.D.fans.
These are vents in the walls of buildings, usually with inclined slats to let air in but keep rain out. Preferably they should be fitted at low level, say 1.2m above the ground, so that the area used by workers gets ventilated. They work best in conjunction with ridge vents. In areas subject to sandstorms, the vents on the windward side should have...