SECTION 15820 - DUCT ACCESSORIES
2.10 DUCT-MOUNTED ACCESS DOORS AND PANELS 7. 2.11 FLEXIBLE CONNECTORS 8. ... galvanized steel pipe rotating within a pipe-bearing assembly mounted on supports at each mullion and at each end of multiple-damper assemblies. ... of straight duct, at 500 Hz, based on 150 mm (6 inch) duct, of 750 m/min (2500 fpm). ................
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