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Orange County Health Department Improvements Smith Sinnett /2024008 <br />Hillsborough,NC Orange County Asset Management Services <br />AIR DUCT ACCESSORIES 23 33 00 - 2 <br />B Turning vane assemblies shall be adequately supported and affixed to prevent rattling,breakaway,and shall <br />not deform.Assemblies longer than 12 inches shall be double wall. <br />C Turning vanes in negative pressure ductwork with pressure rating above 2 inches shall be installed in <br />accordance with SMACNA Industrial Duct Construction Standard. <br />D Turning vanes shall match the duct material construction. <br />E Rectangular Throat Elbow Truning Vanes (Vane Runner Length up to 18"and Vane Length up to 36") <br />1.Provide single blade type vanes having 2"radius and 1-1/2"spacing,24 gauge minimum. Construct <br />vanes in accordance with SMACNA HVAC Duct Construction Standards. <br />2.If duct size changes in mitered elbow,use single blade type vanes with trailing edge extension. <br />F Rectangular Throat Elbow Truning Vanes (Vane Runner Length up to 18"and Vane Length up to 36"): <br />1.Use double wall airfoil type with smoothly-rounded entry nose and extended trailing edge on 2.4" <br />center spacing. <br />2.Vanes shall be equal to HEP (High Efficiency Profile)vanes as manufactured by Aero/Dyne Co. <br />G Radius Elbow Splitter Vanes: <br />1.Splitter vanes for radius elbows shall be extended entire length of fitting and constructed in accordance <br />with SMACNA HVAC Duct Construction Standards. <br />H Manufacturers: <br />1.Aero Dyne <br />2.Ductmate,Inc. <br />3.Sheet Metal Connectors,Inc. <br />4.Duro-Dyne <br />5.DynAir Inc. <br />6.Or Approved Equal <br />2.03 WIRE MESH SCREENS <br />A Screen assemblies shall be removable. <br />B Mesh:1/2 inch square pattern,1/16 inch galvanized wire,interwoven,welded at wire intersections and to the <br />frame to prevent rattles. <br />C Frames:Minimum of 1 inch by 1 inch by 1/8 inch galvanized steel angles for duct sizes through 24 inches, <br />1-1/2 inch by 1-1/2 inch by 3/16 inch for duct sizes between 25 inches and 48 inches,and 2 inches by 2 <br />inches for ducts larger than 48 inches continuous around perimeter of screen.Provide intermediate supports <br />to limit screen deflection to 1/16 inch at maximum design airflow. <br />2.04 FLEXIBLE DUCT 90°ELBOW SUPPORT <br />A Manufacturers: <br />1.Build Right Products <br />2.Hart and Cooley <br />3.Thermaflex <br />4.Or Approved Equal <br />B Pre-manufactured support to form any brand flexible duct into a smooth 90 degree elbow. <br />1.One size shall fit 4"to 16"flexible ducts <br />2.No additional tools shall be required for installation <br />3.UL listed for use in Return Air Plenums <br />2.05 DUCT ACCESS DOORS <br />A Manufacturers: <br />1.Acudor Products Inc,a Division of Nelson Industrial Inc​​ <br />2.Ductmate Industries,Inc,a DMI Company​​ <br />3.Durodyne <br />4.Elgen Manufacturing​​ <br />5.Nailor Industries Inc​​ <br />6.Ruskin Company​​ <br />Docusign Envelope ID: 2D852F9B-A7CF-462A-9536-444A53AA848A