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- Example of a typical commercial building with the space above the drop-ceiling acting as an air-return plenum. If a fire were to start above the drop...(709 × 399 (23 KB)) - 04:20, 11 April 2024
- English Example of a typical commercial building with the space above the drop-ceiling acting as an unintended air-return plenum....(835 × 471 (19 KB)) - 01:14, 10 May 2024