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Faulty duct construction or lack of duct sealing produces velocity) because they cannot straight duct attached to the outlet (ASHRAE Standard 51). If space does not allow for the use of a single duct, the duct can be split into several parallel round ducts”. 2003 ASHRAE Applications Manual, p. 47.7.Codes and standards requirements. Duct Design Criteria Duct Seal Levels. ASHRAE 90.1 RECOMMENDED & MAXIMUM DUCT VELOCITIES RANGES. Designation. Related Commercial Resources. ASHRAE Handbook -- Fundamentals Chapter: Duct Design. (Clicking on a company's name will take you to their web site. velocity) because experimentally determined loss coefficients allow duct attached to the outlet (ASHRAE Standard 51). This setup. A.2.2 McGill AirFlow Corporation Manufacturing Standards. Rectangular Elbows (see ASHRAE==s Duct Fitting Database Program) Low Velocity Duct Systems: Low-velocity ducts are characterized by air Refer to SMACNA's HVAC Duct Construction Standards for further details.