UL181 Class1 HVAC Insulated-Flex R-8” Flexible Ductwork

Description

“HVAC Insulated-Flex R-8” is an insulated air duct designed for use in air conditioning applications. This insulated flexible duct has an R-Value of 8, which is highly prized for use in installations that require the maximum energy savings from an HVAC duct. The “HVAC Insulated-Flex R-8” is sold in four I.D. (inside diameter) sizes and in twenty-five foot lengths. Being available in 4, 6, 8 and 12-inch diameters, makes this hose an excellent choice for almost any type of air ventilation use. In addition to thermal insulation, the thicker and more dense insulation wrap offers excellent acoustical insulation properties. Combining exceptional acoustical performance with an R-Value of 8 makes this Insulated flexible ductwork superior to others on the market. This flexible duct has a temperature range of -30 Fahrenheit to + 150 Fahrenheit. Aesthetically the hose is metallic silver with a yellow insulation duct wrap.

This hose benefits from being a flexible ductwork. Flexible ducts are far easier to install than rigid duct hoses. Since HVAC installations generally lead from an exterior roof or outdoor area into the interior of a building, they make their ways through drop ceilings, attics, or crawl spaces. For air conditioning ducts to make their way through the labyrinth of a building, the ducting needs to bend and turn its way from above and across any structural objects that may be situated on the way. In order for a rigid metal duct to get through such hurdles it may need accessories like elbow, reducers or other connectors. This flexible insulated air duct can twist and turn its way through almost any crawl space and can even compress and expand to reduce the need for fabrication of the hose during installation. The “HVAC Insulated-Flex R-8” has a 5 to 1 compression ratio and can expand 5 times its packaged length. The hose can compress and expand as needed so as to fit the needs of the installation.

This insulated flexible ductwork slows the heat transfer that may be in place between the interior of the hose (i.e., air conditioned air) and exterior of the duct (i.e., exterior temperature level). This insulated air duct reduces convection and uses materials and layers that have low thermal conductivity. Convection is the movement of air driven by differences in temperature between two areas. Convection works by moving heated air from a warmer area to a space colder than its surroundings. These temperature differences then cause the air to move as the hotter, less dense air rises, and the cooler, more dense air sinks. To reduce heat transfer by convection, a duct’s insulating material should contain small cavities of air pockets within. These air pockets serve to confine temperature differences and ensure that air movement is minimized.

UL 181 Ducts | UL 181 Certified Air Duct Manufacturer – Shanghai Qianjing

Shanghai Qianjing Ducting Co., Ltd.​ is a leading UL 181 duct manufacturer​ in China, supplying UL 181 certified air ducts​ for commercial, industrial, and institutional HVAC systems worldwide. Our UL 181 ducts are engineered for fire safety, airtight performance, and long-term durability, fully compliant with U.S. and international building codes.

What Is a UL 181 Duct?

A UL 181 duct​ is a factory-made air duct or connector that has been tested and certified under UL 181 – Standard for Factory-Made Air Ducts and Air Connectors. This certification verifies:

• Flame spread and smoke development​ compliance
• Structural integrity​ under positive and negative pressure
• Long-term performance​ in HVAC and ventilation systems

Specifying UL 181 certified ducting​ helps contractors, engineers, and building owners reduce compliance risk and accelerate project approvals.

Our UL 181 Duct Product Range

We manufacture a complete line of UL 181 air ducts, including:

• UL 181 Class 0 / Class 1 Flexible Ducts​ – for low to medium pressure HVAC systems
• UL 181 Rigid Ducts & Air Connectors​ – for high-integrity air distribution
• UL 181 Listed Insulated Ducts​ – with thermal and acoustic performance
• Custom UL 181 duct solutions​ – tailored to project specifications

All products are tested to UL’s latest standards and manufactured under an ISO-based quality management system.

Key Features & Benefits

•  UL 181 Listed & Labeled​ – third-party certified by UL Solutions
•  Fire-Resistant & Low Smoke​ – meets strict fire safety requirements
•  Airtight & Leakage-Controlled​ – improves HVAC system efficiency
•  Corrosion & Moisture Resistant​ – suitable for demanding environments
•  Code-Compliant for Global Projects​ – accepted in U.S., Asia, and international markets

Technical Specifications (Overview)

For detailed technical data sheets (TDS) and installation guidelines, contact our technical team.

Applications

Our UL 181 certified ducts​ are widely used in:

• Commercial office buildings
• Hospitals and healthcare facilities
• Airports, stations, and public infrastructure
• Industrial plants and cleanrooms
• Data centers and energy projects

Why Choose Qianjing UL 181 Ducts?

• Proven Certification​ – Officially awarded UL 181 certificate by UL Solutions (Dec 11, 2025)
• End-to-End Quality Control​ – from raw material inspection to finished product testing
• Global Supply Capability​ – export experience across Asia, North America, and beyond
• Engineering Support​ – duct sizing, layout consultation, and installation guidance

Built on Craftsmanship, Driven by Safety

Guided by our philosophy “Humility Casts Crystal, Pipes Connect the Future,”​ we treat UL 181 certification not as a finish line, but as a new starting point—to deliver safer, higher-quality ducting solutions and showcase the credibility of Made in China​ on the global stage.

Get a Quote for UL 181 Ducts

Looking for a reliable UL 181 duct supplier?

Contact Shanghai Qianjing Ducting Co., Ltd.​ today for product catalogs, technical data, and competitive pricing.

 Email: admin@xuanyuanafd.com

 Website: www.ductingxy.com

 Phone / WhatsApp:13918360649