other components positioned there between but this is not a requirement still further some structural relationships or orientations may be designated with the word u201c substantially u201d in those cases it is meant that the relationship or orientation is as described with allowances for variations that do not effect the cooperation of the so described component or components the present flood vent 10 comprises a bezel 26 connected to two opposing walls 22 an upper wall 22 and a sill 28 to form a duct 15 within a housing 20 see fig1 4 and 6 the flood vent 10 has an interior duct opening 17 on the inside of the structure and an exterior duct opening 19 on the outside of the structure see fig4 duct 15 allows fluid communication between the interior and exterior of the structure when floodwaters rise above sill 28 bezel 26 surrounds a periphery of an exterior duct opening 19 and serves to attach housing 20 to structure by fasteners or adhesive housing 20 can have outer dimensions that correspond with the nominal dimensions of concrete masonry units cmu in a preferred embodiment housing 20 has outer nominal dimensions that correspond to a cmu 8 namely eight inches 8 u2033 high sixteen inches 16 u2033 long and eight 8 u2033 wide all nominal dimensions housing 20 walls 22 bezel 26 and sill 28 can be constructed of materials such as metal plastic concrete cement composites or a combination thereof a shutter 30 is pivotally fixed to an upper region of duct 15 so that shutter 30 is capable of swinging in.