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ESR -2074 i Most Widely Accepted and Trusted Page 3 of 5 <br />FIGURE 2—SMART VENT MODEL 1540-520 <br />FIGURE 3—SMART VENT: SHOWN WITH FLOOD DOOR PIVOTED OPEN <br />S I <br />FIGURE 2—SMART VENT MODEL 1540-520 <br />FIGURE 3—SMART VENT: SHOWN WITH FLOOD DOOR PIVOTED OPEN <br />