| http://www.w3.org/ns/prov#value | - Duct Pipes, tubes, or other enclosures used for the purpose of pneumatically conveying materials. [91, 2004] Duct Burner A burner, mounted in a duct or discharging into a duct, used to heat the air, flue gas, or combustion turbine exhaust gas in the duct.
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