Salient Characteristics SpecificationTitle: Galvanized Steel Quick-Disconnect Ductwork and Components for Air-Conditioning SystemSubject: Supply of modular galvanized steel quick-disconnect ductwork, fittings, dampers, and support hangers.Basis of Design: The part numbers below are for reference and configuration cross-reference. Products offered may be from another acceptable manufacturer, provided they meet or exceed all salient characteristics and are fully compatible with the complete ductwork system.1. Scope and PurposeThis requirement is for the supply and delivery only of galvanized steel, modular quick-disconnect ductwork and associated fittings for an air-conditioning system. The supplied components shall form a mutually compatible duct system consisting of straight duct sections, reducers, wye connectors, elbows, airflow dampers, and saddle hangers.Installation, field fabrication, field welding, and connection to existing equipment are not included unless specifically added elsewhere in the solicitation.2. General Salient Characteristics. All offered items shall meet the following minimum requirements: Material: Items 1 through 26 shall be galvanized steel only. No stainless steel, aluminum, plastic, or uncoated carbon-steel substitutes shall be accepted.System Compatibility: All duct, fittings, dampers, and hangers shall be compatible with the specified quick-disconnect duct system. Components of the same nominal duct diameter shall connect directly without adapters, field welding, rivets, sheet-metal screws, or permanent field modification.Quick-Disconnect Connection: Straight duct sections, reducers, wye connectors, elbows, tees, and dampers shall use a quick-disconnect connection configuration compatible with the remaining supplied components. Connection features shall permit assembly and disassembly of the duct system without damage to the duct or fittings.Nominal Dimensions: Duct diameters and fitting dimensions listed in the schedule are nominal inside diameters unless the manufacturer���s standard quick-disconnect system identifies dimensions differently. Reducers shall transition between the listed inlet and outlet diameters. Fittings shall be sized to directly mate with the corresponding duct diameter.Gauge Requirements: Straight duct sections and dampers shall be 20-gauge galvanized steel where identified in the schedule. Reducers, elbows, wye connectors, tees, and 90-degree fittings shall be 18-gauge galvanized steel where identified in the schedule. Saddle hangers shall be 14-gauge galvanized steel where identified in the schedule.Quality and Condition: Products shall be new, free of corrosion, dents, sharp edges, cracks, deformation, damaged coating, or manufacturing defects that would prevent proper assembly or service. Duct sections shall be round, and fittings shall retain their intended shape to allow proper connection. Components shall be packaged and shipped to prevent damage or distortion in transit.Equal Products: An offered equal product shall meet every listed dimensional material, gauge, connection, configuration, and quantity requirement. The offeror shall provide manufacturer specifications or product literature sufficient to verify compliance when requested.3. Required Items ScheduleItem. Required Item / Salient Characteristics. Minimum Material / Gauge. Qty. Reference No.*1. Quick-disconnect straight duct, nominal 24-inch diameter. Galvanized steel, 20 ga 17 EA 10024.2. Quick-disconnect reducer, 24-inch inlet to 22-inch outlet Galvanized steel, 18 ga 5 EA 16024.3. Quick-disconnect straight duct, nominal 22-inch diameter Galvanized steel, 20 ga 20 EA 10022.4. Quick-disconnect reducer, 22-inch inlet to 20-inch outlet Galvanized steel, 18 ga 5 EA 16022.5. Quick-disconnect straight duct, nominal 20-inch diameter Galvanized steel, 20 ga 17 EA 10020.6. Quick-disconnect reducer, 20-inch inlet to 18-inch outlet Galvanized steel, 18 ga 5 EA 16020.7. Quick-disconnect 45-degree wye connector, nominal 24-inch duct size Galvanized steel, 18 ga 1 EA 14224.45.8. Quick-disconnect 45-degree elbow, nominal 22-inch duct size Galvanized steel, 18 ga 1 EA 12022.45.9. Quick-disconnect manual butterfly valve airflow damper, nominal 22-inch duct size Galvanized steel, 20 ga 1 EA 19422.10. Quick-disconnect straight duct, nominal 18-inch diameter Galvanized steel, 20 ga 28 EA 10018.11. Quick-disconnect tee, 18-inch �� 18-inch �� 18-inch Galvanized steel, 18 ga 1 EA 14318.12. Quick-disconnect straight duct, nominal 16-inch diameter Galvanized steel, 20 ga 19 EA 10016.13. Quick-disconnect reducer, 18-inch inlet to 16-inch outlet Galvanized steel, 18 ga 3 EA 16018.14. Quick-disconnect 45-degree elbow, nominal 16-inch duct size Galvanized steel, 18 ga 2 EA 12016.45.15. Quick-disconnect manual butterfly valve airflow damper, nominal 16-inch duct size Galvanized steel, 20 ga 2 EA 19416.16. Quick-disconnect 90-degree elbow, nominal 20-inch duct size Galvanized steel, 18 ga 2 EA 12020.90.17. Saddle hanger sized for nominal 24-inch duct Galvanized steel, 14 ga 14 EA 17024.18. Saddle hanger sized for nominal 22-inch duct Galvanized steel, 14 ga 14 EA 17022.19. Saddle hanger sized for nominal 20-inch duct Galvanized steel, 14 ga 14 EA 17020.22. 16-inch galvanized clamp with white nitrile gasket, 27 EA 13016-GA-N.23. 18-inch galvanized clamp with white nitrile gasket, 30 EA 13018-GA-N.24. 20-inch galvanized clamp with white nitrile gasket, 25 EA 13020-GA-N.25. 22-inch galvanized clamp with white nitrile gasket, 28 EA 13022-GA-N.26. 24-inch galvanized clamp with white nitrile gasket, 24 EA 13024-GA-N.*Reference numbers are not brand-name requirements and are included only to identify the intended configuration and compatibility standard. Galvanized Ducting shall be Standard 5-feet Lengths and 11-inch Galvanized Standard Adjustable Sleeves where applicable.4. Component-Specific Requirements shall be galvanized steel:4.1 Saddle Hangers (items 17-21) used for handing duct systems and reducing sway Shall be nominal 24-inch diameter 14 ga 14 EA 17024, 22-inch diameter 14 ga 14 EA 17022, 20-inch diameter 14 ga 14 EA 17020, 18-inch diameter 14 ga 18 EA 17018, or 16-inch diameter 14 ga 14 EA 17016, as identified in the item schedule. Shall use the required quick-disconnect end configuration.4.2 Reducers Shall be galvanized steel, 18 gauge. Shall provide the listed nominal transitions: 24 x 22 inches, 22 x 20 inches, 20 x 18 inches, and 18 x 16 inches. Shall have quick-disconnect ends compatible with the adjoining duct sections.4.3 Elbows, Wye Connector, and Tee, shall be galvanized steel, 18 gauge. Shall have the listed nominal diameter and directional configuration. The wye connector and applicable elbows shall be 45 degrees as listed. The 20-inch elbow shall be 90 degrees. The tee shall be 18 inches �� 18 inches �� 18 inches. All ends shall be compatible with the required quick-disconnect duct system.4.4 Airflow Dampers Shall be galvanized steel, 20 gauge. Shall be sized for 22-inch or 16-inch nominal quick-disconnect duct, as identified in the item schedule. Shall be suitable for controlling airflow within the compatible duct system. 4.5 Saddle Hangers Shall be galvanized steel, 14 gauge. Shall be contoured and sized to support the corresponding nominal duct diameter without crushing, deforming, or damaging the duct. Shall be suitable for attachment to the Government���s selected overhead support method. 5. Inspection and Acceptance the Government may inspect delivered items for: Correct item type, nominal size, gauge, and quantity; Galvanized-steel construction; Compatibility of quick-disconnect connections among offered components; Required elbow, wye, tee, reducer, damper, and hanger configurations; Damage, deformation, corrosion, or deficient protective packaging; and Manufacturer literature or other documentation supporting compliance with the salient characteristics. Items that do not meet the stated requirements may be rejected.
