noun
A physical wall or barrier built for protection, such as a blast wall, flood wall, or defensive fortification. Also used figuratively for a safeguard or shield.
工場の周りに防護壁が設置された。
A protective wall was installed around the factory.
この防護壁は爆風から作業員を守る。
This protective wall shields workers from the blast.
隔壁 refers to a partition or bulkhead, typically for dividing spaces rather than primarily for protection.
Compound of 防護 (ぼうご, 'protection') and 壁 (へき, 'wall').