Abstract: A pressure relief assembly may include at least one pressure relief chamber including a membrane support base connected to a counterbalance clearance space. The membrane support base defines one or more air passages. The pressure relief assembly may also include at least one flap sub-assembly pivotally secured to the at least one pressure relief chamber. Each flap sub-assembly may include a pivot bracket pivotally secured to the at least one pressure relief chamber and including a counterbalance configured to pivot into the counterbalance clearance area, and a membrane flap securely connected to the pivot bracket. The membrane flap seats on the membrane support base over the one or more air passages in a closed position, and is configured to move into an open position. The counterbalance counterbalances the membrane flap and pivots into the counterbalance clearance area when the membrane flap moves into the open position.

Abstract: A pressure relief assembly may include at least one pressure relief chamber including a membrane support base connected to a counterbalance clearance space. The membrane support base defines one or more air passages. The pressure relief assembly may also include at least one flap sub-assembly pivotally secured to the at least one pressure relief chamber. Each flap sub-assembly may include a pivot bracket pivotally secured to the at least one pressure relief chamber and including a counterbalance configured to pivot into the counterbalance clearance area, and a membrane flap securely connected to the pivot bracket. The membrane flap seats on the membrane support base over the one or more air passages in a closed position, and is configured to move into an open position. The counterbalance counterbalances the membrane flap and pivots into the counterbalance clearance area when the membrane flap moves into the open position.