American Aldes CCV Modulo Self-Balancing Crawl Space Control Valve attaches to the supply air ductwork of central forced air conditioning systems and regulates the recommended amount of conditioned air to sealed crawlspaces or basements. The CCV Modulo includes a duct adapter, backdraft damper, and field-adjustable Constant Airflow Regulator (MR Modulo). The CCV Modulo is available in sizes 4″, 5″ and 6″.

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