explosion door

At least one explosion door is provided in the casing of each unit.

Together, Jim and Mary clumped across the room, waited for the tons-heavy explosion door to swing open, then clumped through.

The technology of protection can range in price dramatically but where the type of device is rational to use, would typically be from least to most expensive solutions: explosion doors and vents (dependent on quantities and common denominators, either may end up the wise price choice); inerting: explosion suppression; isolation - or combinations of same.