Abstract: A quick-release vent structure and method for releasing a rapid pressure buildup within a vessel such as a storage bin. Vent covers are releasably seated over large vent openings presented by framework which is mounted to the vessel. Each cover is resiliently biased in place. Gas pressure in the vessel can lift the cover from the vent opening for pressure relief. If pressure raises the cover a distance greater than a predetermined amount, the biasing force is released from the cover by a quick-release mechanism and the pressure can blow the cover off without damage.The covers are preferably held in place by spring-loaded, snap action clamps. Each clamp includes a latch member that is pressed against the vent cover by an over-center spring. When the pressure force exceeds the spring force, the latch member is cammed to swing over-center and slides off the cover edge, thereby releasing the cover so that the gas pressure can blow it off and vent extremely rapidly.