An explosion isolation device is disclosed. The explosion isolation device may comprise a conduit having a flap configured to rotate between an open position and a closed position within the conduit, and a holding mechanism configured to hold the flap in the open position. The holding mechanism may be configured to release the flap in the event of an explosion and the flap may be configured to rotate into the closed position after it is released. The device may include a sensor and an actuator configured to actuate the holding mechanism when an explosion is sensed. The conduit may be vertical.