You can create your traps so that their triggered effects occupy a larger space.

Benefit: You can alter a burst, emanation, or spread-shaped trap to increase its area. Any numeric measurements of the trap’s effects area increase by 100%. A widened trap uses up a trap slot three levels higher than the trap’s actual level.

Traps that do not have an area of one of these four sorts are not affected by this feat. Only the effects of the trap are widened; the trap itself still only occupies one 5-foot square.