This air filter is shaped like the louvers of air ducts that you often find installed in walls. Since louvers are symbolic of the passage that air takes, it would perhaps feel as if the air really was being cleaned before your eyes if this louver-shaped air filter was placed in a room and drew in something visible like cigarette smoke before you. The passage that air takes has its own fixed shape. It may seem that making the air filter the shape of the louvers found in the air passage-rather than creating some kind of new shape-is extremely normal, but that is not the general opinion. That's why this is a Super Normal air filter.