PVC Duct Flanges

PVC duct flanges are low profile fittings used to securely join or seal ductwork sections in ventilation, fume handling, and exhaust systems. PVC duct flanges come in socket flange and blind flange fitting types. Duct socket flanges provide a mounting surface between duct pipes or fittings, allowing connection to other components or surfaces. Duct blind flanges are flat cap flanges used to terminate ductwork or temporarily seal off open duct ends. PVC duct flanges are primarily used to allow the assembly and disassembly of ductwork and ventilation systems. Flanges often feature predrilled holes around their perimeter (standard) through which hardware bolts can be inserted to join two flanges together. This creates a tight seal between the connecting components to prevent leaks and maintain system integrity. Due to their PVC construction, PVC duct flanges are rated for many ductwork applications that handle fumes, vapors, exhausts, gaseous media, and airborne dust, contaminants, or particulates.

These are USA made PVC duct flanges built by Harrison Machine and Plastic under the trade name SUPERDUCT®, one of the nation’s top manufacturers and brands of thermoplastic ductwork. SUPERDUCT® flanges are to be used with air and compatible gaseous media in open air, non-pressurized applications only. They are not for use in pressure systems, with liquids, or with known incompatible chemicals. Always verify chemical compatibility prior to use. 

PVC duct pipe flanges are available in socket flanges and blind flanges. Duct socket flange sizes range from 2″ to 24″ in diameter. Duct blind flange sizes range from 3″ to 24″ in diameter. PVC duct flanges are made to Iron Pipe Size (IPS) sizing standard. All flanges are 3/16″ thick material. All bolt holes are 5/16″ diameter. Undrilled socket flanges or flanges with 150# drilling are available on request.

PVC duct socket flanges feature a slip joint end made for solvent weld or hot air weld connection to a duct section. For solvent weld installation, a professional PVC primer and solvent cement are recommended for socket flanges up to 14″ in size. Hot air welding is recommended for socket flanges larger than 14″ in size. Blind duct flanges are made for bolt and hardware installation only. 

PVC duct flanges are made from premium industrial grade PVC material per ASTM D1784 standards for high purity, product consistency, and reliable performance. They are built and tested to deliver a long service life and compatibility with a wide range of applications, property types, and ventilation systems.

• Material Profile: Type I Grade I PVC Cell Class 12454-B. 
• Color: Dark gray. 
• Performance Standards: Meets and/or exceeds ASTM D testing standards for ductwork applications. 
• Pressure: For non-pressurized systems only. 
• Temperature: Approved for up to 140°F (60°C). 
• Sizing Standard: Schedule 40 / IPS thickness standard. 
• Size Options: Range from 2″ to 24″ in diameter. 
• Connection Options: Pre-drilled bolt holes, insertion socket.

SUPERDUCT® PVC flanges can securely connect and disconnect ductwork sections while providing lasting durability for handling various fumes, exhausts, gasses, air, dust, and particulates. 

• PVC Material: Heavy duty thermoplastic with excellent corrosion resistance and durability that will not rust or degrade. 
• Chemical Resistance: Resistant to many acids, alkalis, alcohols and their gasses, fumes, and vapors.
• Secure, Versatile Joints: Made for reliable and removable ductwork connections. 
• Multiple Options: Available in socket flange, blind flange, and several options for bolt holes to match project needs. 
• Hard Working: Engineered for long term service and minimal maintenance to keep ductwork systems operating.
• Airtight: Will provide a secure, long lasting seal when properly installed.
• Easy to Install: Lightweight and impact resistant for easy handling and installation. 

Common applications and uses for PVC duct flanges include industrial HVAC systems, chemical processing plants, waste and water treatment facilities, and manufacturing, institutional, and public buildings that require a secure, corrosion resistant ductwork connection for an onsite ventilation system. 

Harrison PVC SUPERDUCT® flanges are a leading choice in quality and performance, trusted by professionals for decades. They are precision engineered to deliver the reliable, long lasting service that ductwork systems require. Manufactured to the highest standards from premium materials, our ductwork pipe supplies are made to exceed requirements. For more information or details on contractor pricing, contact us.