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A flood vent includes a door pivotable within a frame between a closed position and an open position. A fluid trigger that is triggerable by a fluid to allow the door to pivot from the closed position to the open position includes a retainer and a fluid modifiable material. The fluid modifiable mate

A flood vent includes a door pivotable within a frame between a closed position and an open position. A fluid trigger that is triggerable by a fluid to allow the door to pivot from the closed position to the open position includes a retainer and a fluid modifiable material. The fluid modifiable material is positioned between the door and the retainer thereby obstructing the door from pivoting from the closed position to the open position until the fluid modifiable material is modified by contact with the fluid.

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1. A flood vent, the vent comprising: a door pivotable within a frame between a closed position and an open position;a fluid trigger triggerable by a fluid to allow the door to pivot from the closed position to the open position, wherein the fluid trigger comprises a retainer anda fluid modifiable m

1. A flood vent, the vent comprising: a door pivotable within a frame between a closed position and an open position;a fluid trigger triggerable by a fluid to allow the door to pivot from the closed position to the open position, wherein the fluid trigger comprises a retainer anda fluid modifiable material, wherein the fluid modifiable material is positioned between the door and the retainer thereby obstructing the door from pivoting from the closed position to the open position until the fluid modifiable material is modified by the fluid. 2. The vent of claim 1, wherein the fluid modifiable material comprises a water soluble composition configured to dissolve when contacted with flood waters. 3. The vent of claim 1, wherein the retainer and fluid modifiable material are both positioned on a same side of the door corresponding to the direction of pivoting of the door from the closed position to the open position. 4. The vent of claim 1, wherein the door is configured to automatically pivot from the closed position to the open position when the fluid modifiable material is modified by the fluid. 5. The vent of claim 1, wherein the door is biased to pivot from the closed position to the open position by a spring such that the door automatically pivots from the closed position to the open position when the fluid modifiable material is modified by the fluid. 6. The vent of claim 1, wherein the fluid trigger comprises a trigger regulator. 7. The vent of claim 6, wherein the trigger regulator is configured to regulate a level of the fluid required before the fluid contacts the fluid modifiable material to modify the fluid modifiable material. 8. The vent of claim 6, wherein the trigger regulator comprise the retainer, and wherein the retainer extends from a lower wall of the frame to a position corresponding to the level of the fluid required before the fluid contacts the fluid modifiable material to modify the fluid modifiable material. 9. The vent of claim 6, wherein the trigger regulator comprises a passage defined in the door configured to regulate a level of the fluid required before the fluid contacts the fluid modifiable material to modify the fluid modifiable material. 10. The vent of claim 9, wherein the fluid modifiable material is positioned to seal the first side of the door from the second side of the door when the fluid modifiable material is unmodified by the fluid. 11. The vent of claim 6, wherein the trigger regulator comprises a passage defined in the door and extending between a first side and a second side of the door, and wherein the fluid modifiable material is positioned adjacent to the first side of the door such that passage regulates access to the fluid modifiable material by fluid at the second side of the door. 12. The vent of claim 9, wherein the trigger regulator further comprises a rain guard positioned on the door above the passage, and wherein the rain guard is dimensioned to direct rain water away from the passage. 13. A flood vent, the vent comprising: a door pivotable within a frame between a closed position and an open position;a fluid trigger triggerable to allow the door to pivot from the closed position to the open position, wherein the fluid trigger comprises a fluid modifiable material positioned against the door thereby obstructing the door from pivoting from the closed position to the open position until the fluid modifiable material is modified by a fluid. 14. The vent of claim 13, wherein the fluid modifiable material comprises a material configured to modify upon contact with water. 15. The vent of claim 14, wherein modification of the fluid modifiable material upon contact with water comprises dissolution of the fluid modifiable material. 16. The vent of claim 13, further comprising a spring coupled to the door, wherein the spring is configured to pull the door from the closed position to the open position upon fluid modification of the fluid modifiable material.