How far off a crawl space floor must a duct be installed as a minimum?

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Multiple Choice

How far off a crawl space floor must a duct be installed as a minimum?

Explanation:
Keep ductwork in crawl spaces elevated from the floor to protect it from moisture, pests, and debris, and to allow space for insulation and a vapor barrier as well as easy inspection and service. The minimum distance recommended is four inches, which provides enough clearance to prevent damp flooring from affecting the duct and to work around it during installation. Going lower increases the risk of moisture contact and damage, while going higher than needed adds little protective benefit and can make the install more cumbersome.

Keep ductwork in crawl spaces elevated from the floor to protect it from moisture, pests, and debris, and to allow space for insulation and a vapor barrier as well as easy inspection and service. The minimum distance recommended is four inches, which provides enough clearance to prevent damp flooring from affecting the duct and to work around it during installation. Going lower increases the risk of moisture contact and damage, while going higher than needed adds little protective benefit and can make the install more cumbersome.

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