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Orange County Health Department Improvements Smith Sinnett /2024008 Hillsborough,NC Orange County Asset Management Services HVAC DUCTS AND CASINGS 23 31 00 - 5 3.Button punch snap lock construction (SMACNA L-2)is not allowed except for ductwork that is both low pressure (2”WG or lower pressure class)and 18”and smaller duct width. 4.Button punch snap lock construction is not allowed for ductwork in chases and areas above inaccessible ceilings. 5.Button punch snaplock construction is not allowed on exhaust ductwork or aluminum ductwork B Round and Oval Duct 1.Unless otherwise indicated,longitudinal seams shall be in accordance with SMACNA HVAC Duct Construction Standards with the following exceptions: a.Snaplock seams are not allowed. b.SMACNA seam types RL-3,6A,6B,7,and 8 shown in Figure 3-2 are not allowed,except for 2" w.g.class round ducts 16"or less in diameter. 2.08 RECTANGULAR TRANSVERSE JOINT CONNECTORS: A Slide-on Transverse Joint Connectors: 1.Duct constructed using engineered slide-on connector systems must be submitted and conform to manufacturer’s published duct construction standards and guidelines for joint classification,sheet metal gauge,intermediate and joint reinforcement size and spacing,unless otherwise specified. 2.Manufacturer of engineered connector system must have certified independent performance testing for leakage,deflection and seismic stability. 3.All components of the engineered system must be clearly embossed with the manufacturer’s name, model number or identifying marking. 4.Butyl rubber gasket must be applied per the manufacturer’s instructions on all connections except for breakaway connections.Closed Cell Neoprene gasket must be applied per the manufacturer’s instructions on all breakaway connections.No substitution of connector system components or gaskets is permitted. 5.All duct installed using engineered connectors must adhere to the manufacturer’s published assembly and installation guidelines for all standard,breakaway,roof-top or specialty connections unless otherwise specified. B Formed-on Flanges: 1.Lockformers TDC or Engles TDF may be used in accordance with T-25 flanges of SMACNA HVAC Duct Construction Standards,provided that corner pieces with bolts are used. If TDF/TDC flanges are damaged,replace the damaged joint(s)by straightening and reinforcing with minimum 1-1/2 x 1-1/2 x 1/4 angle at each side of transverse joint PART 3 EXECUTION 3.01 INSTALLATION A Install,support,and seal ducts in accordance with SMACNA (DCS). B During construction,provide temporary closures of metal or taped polyethylene on open ductwork to prevent construction dust from entering the ductwork system. C All "paint grip"or mill phosphatized ductwork shall be cleaned and treated and prepped per SSPC/NACE Standard SP-1 prior to application of paint. D Install ductwork parallel to building walls and ceilings and at such heights not to obstruct any portion of window,doorway,stairway,or passageway. Install ductwork to allow adequate access and service space for equipment and access clearances for cable tray/j-hooks.Refer to drawings and/or manufacturer's recommendations Install vertical ductwork plumb. Make allowances for beams,pipes or other obstructions in building construction and for work of other contractors. Check plans showing work of other trades and consult with Engineer in event of any interference. E Where interferences develop in the field,offset or reroute ductwork as required to clear such interferences. Do not divide duct and do not route any other utilities such as piping or conduit through duct. In all cases, consult drawings for exact location of space allocated for duct,ceiling heights,door and window openings, Docusign Envelope ID: 2D852F9B-A7CF-462A-9536-444A53AA848A