Flexible Insulated Duct

Move air quietly and efficiently with Flexible Insulated Duct. Choose R6 or R8 insulation with silver, black (mobile home), or AMG blue jackets for clean, code-friendly installs.

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Flexible Insulated Duct

Our flexible insulated ductwork is built for distributing conditioned air through HVAC systems, connecting supply and return trunks to registers, and making retrofit runs in tight spaces while reducing noise transmission. Homeowners, DIY-savvy users, licensed contractors, property managers, and light commercial teams can all count on dependable performance at a budget-friendly price point, typically ranging from $40 to $173 depending on diameter and insulation.

Select from four subcategories to match your job: R6 Silver Jacket for standard residential runs, R8 Silver Jacket for colder climates or energy codes that require higher insulation, Mobile Home Black Jacket that’s rated for manufactured housing, and Antimicrobial (AMG) Blue Jacket for added microbial resistance in high-humidity or sensitive areas. Common sizes range from 4 to 20 inches in diameter with standard 25-foot lengths for efficient layout and fewer joints.

As a passive air-delivery component, SEER2, BTU, tonnage, and refrigerant specs do not apply to ductwork. Focus instead on insulation value (R6 vs R8), jacket type, UL 181 compliance, and sizing the duct to the required room airflow (CFM) for proper static pressure and comfort.

Top Brands for Flexible Insulated Duct

We stock trusted options from Quietflex, known for consistent quality, smooth inner cores for low resistance, durable jackets, and dependable performance across residential and light commercial projects.

Frequently Asked Questions

  • What is the difference between R6 and R8 flexible duct insulation?

    R8 has thicker insulation for reduced heat gain/loss and better energy performance. It’s often required by stricter codes or long/hot attic runs, while R6 is lighter and easier to handle.

  • Is flexible duct with a black jacket approved for mobile homes?

    Yes, when the product is specifically listed for manufactured housing. Our Mobile Home Black Jacket options are rated for that use-always verify local code requirements.

  • When should I choose antimicrobial (AMG) blue jacket duct?

    Use AMG blue for areas with elevated humidity, odor, or IAQ concerns such as basements, certain commercial spaces, or where added microbial resistance is desired.

  • What diameters and lengths are typically available for flexible insulated duct?

    Most projects use 4-20 inch diameters with a standard 25-foot length. Choose diameter based on required CFM, static pressure, and available space.

  • Can homeowners install flexible duct themselves or is a pro recommended?

    Capable DIYers can handle straightforward replacements if allowed locally. For design, permits, and final balancing, a licensed HVAC professional is recommended.

  • How do I determine the correct duct size for a room or branch run?

    Size using ACCA Manual D with room airflow from Manual J. This ensures correct CFM and static pressure-consult a contractor if you’re unsure.

  • What are best practices for supporting and routing flexible duct to maintain airflow?

    Keep the inner core fully stretched, minimize bends, support at least every 4 feet with wide straps, maintain large bend radii, and seal with UL 181-rated mastic/tape.

  • Is this flexible duct suitable for light commercial applications?

    Yes, where allowed by code and specifications. Verify UL 181 Class 1, pressure/temperature ratings, and project requirements before installation.

  • How do I connect flexible duct to collars and boots?

    Slide the inner core over the beaded collar, clamp and seal with mastic, then pull insulation and jacket over the collar and secure with UL 181B-FX tape and a second strap.

  • What is the proper way to cut flexible duct to length?

    Score the jacket and insulation with a knife, cut the helix wire with snips, then tape the cut ends. Avoid compressing the core to preserve airflow.

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