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Ventilation Guide - Sub-Zero

Ventilation Guide - Sub-Zero

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connected to the transition. Downdraft systems do not have a backdraft damper. High altitudes: Ventilation systems are less effective at altitudes above 5,000' (1524 m). At these altitudes, you should estimate a 20–25% reduction in CFM performance. A higher CFM blower and increasing the duct size is rec-ommended.

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