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NFPA 68 mentioned " with a tethered or translating vent enclosure. Pls advise what is translating vent closure means?

Question asked by nickylam on Dec 7, 2016

NFPA 68 to are the guideline for deflector. (2) mentioned limitation on this guideline. It said we should not used this guideline with a tethered or translating vent closure. Anyone know what is translating vent closure means?