The supply air inducer is attached to supply side of the ductwork and will introduce a small amount of conditioned air into the crawl space to help regulate the RH. It includes a backflow damper to keep bad air from entering the system.
50 cfm (where building code requires 1 cfm per 30 sq. ft., this unit will cover up to 1,500 sq. ft.)
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The product works as described. I was very satisfied with the quality of the manufacturing. I would definitely recommend the air inducer to anyone needing to condition a crawlspace.