Door flood barriers have a 1/4-in. marine-grade aluminum-alloy shields that slip into aluminum brackets that are either interior or exterior pre-installed, and locked in place. The brackets have compression seals of closed-cell rubber sides and bottom to prevent leakage. The 30-in.-high x 48-in.-wide shields are stackable for added height, and optional interlocking posts extend width for large openings. Custom sizes are available.