CPVC Duct Rain Caps

CPVC duct rain caps are terminal fittings used to cover and protect the ends of ductwork in ventilation, exhaust, and air conditioning systems. They are made from chlorinated polyvinyl chloride (CPVC) thermoplastic for superior durability and resistance to chemicals and high temperatures. CPVC duct rain caps are made for installation on exterior vent stacks and relief pipes on CPVC duct networks. They are designed to prevent precipitation, animals, and debris from entering ductwork while allowing gasses and air to be vented out to ensure the system remains dry and operational. CPVC duct rain caps come in Style A and Style B products. Available CPVC duct Style A rain caps provide a physical barrier that covers the top of the duct opening to effectively deflect rain and debris. Available CPVC duct Style B rain caps feature a narrow top and are designed for zero static pressure loss. CPVC duct rain caps protect ductwork system integrity by preventing damage that can occur due to water infiltration, debris blockages, or animal access. Rain caps also help prevent potential mold growth and rust concerns for connected metal components by keeping ductwork dry.

These are USA made CPVC duct rain caps built by Harrison Machine and Plastic® under the trade name SUPERDUCT®, one of the nation’s top manufacturers and brands of thermoplastic ductwork. SUPERDUCT® rain caps 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.

CPVC duct rain cap sizes range from 2″ up to 24″ in Iron Pipe Size (IPS) sizing standard. CPVC duct rain caps feature a belled end socket type connection joint. For installing CPVC duct rain caps up to 14″ in size, a professional CPVC primer and solvent cement are recommended. Hot air welding is recommended to install CPVC rain caps larger than 14″ in size.

CPVC duct rain caps are manufactured from premium FM4910 specification Corzan® virgin CPVC and engineered to meet ASTM D1784 quality standards. They have been tested, rated, and certified to ASTM testing standards for CPVC ductwork fittings. These technical specifications and standards guarantee the rain caps are made of high purity, consistent material and provide reliable performance in mechanical strength, chemical durability, temperature range, and fire resistance properties.

• Material Profile: Type IV Grade I CPVC Cell Class 23447. 
• Color: Medium gray. 
• Performance Standards: Meets and/or exceeds CPVC ASTM D testing standards for ductwork applications. 
• Pressure: For non-pressurized systems only. 
• Temperature: Approved for up to 200°F (93°C). 
• Sizing Standard: Schedule 40 / IPS thickness standard. 
• Size Options: Range from 2″ to 24″ in diameter. 
• Connection Options: Belled socket ends.

Heavy duty CPVC rain caps protect vent stacks and ductwork systems with long term service, strength, and corrosion resistance suitable for hardworking applications that handle fumes, exhausts, or gasses. The rain caps have a lightweight construction for easy installation, working temperature tolerance for systems venting air media up to 200°F, and superior chemical compatibility to withstand harsh materials. 

• CPVC Material: High performance thermoplastic with superior strength, chemical resistance, and temperature tolerance. 
• Chemical Resistance: Generally resistant to most acids, bases, salts, aliphatic solutions, oxidants, and halogens.
• Weather Resistant: Lasting durability against weather conditions. 
• Intrusion Prevention: Safeguards ductwork from precipitation, debris, and animal activity. 
• Project Matching: Type A and Type B rain cap types available. 
• Heavy Duty: Built for lasting strength and durability in hardworking ductwork systems.
• Airtight: Provides secure, leakproof seal when properly installed.
• Easy Installation: Low weight and damage resistant for easy handling when installing.

Common applications and uses for CPVC duct rain caps include commercial and industrial HVAC systems, in exhaust ducts servicing onsite equipment, and in vent stacks that handle fumes, dust, and particulates generated from onsite processes. Industries and sectors these fittings are used in include chemical processing, product manufacturing and finishing, industrial facilities, laboratories, research and educational facilities, food and beverage production, plating, semiconductor and electronics production, and waste treatment facilities. Rain caps are essential in any application where ductwork has an external ventilation port that requires protection from precipitation and foreign objects to maintain system performance and safety.

Harrison SUPERDUCT® CPVC rain caps are an industry professional’s trusted choice for top quality and high performance. The fittings are designed and manufactured to provide the durable, dependable service that hardworking duct systems demand. Engineered to exceed requirements and made using premium materials, our CPVC duct supplies are built to deliver results. Contact us for more information on our products or for details on contractor pricing and availability.