The US flexible duct market is projected to exceed $1.8 billion by 2027, driven by new residential construction, energy code upgrades requiring higher R-value insulation, and growing demand for HVAC retrofit projects. Whether you are an HVAC contractor sourcing insulated flex duct for a subdivision, a distributor evaluating new product lines, or a building owner pricing a commercial project, choosing the right flexible duct manufacturer directly impacts installation efficiency, system performance, and long-term durability.
This guide profiles the top 10 flexible duct manufacturers and suppliers in the United States for 2026, covering everything from industry giants with plants on four continents to specialized suppliers offering direct pricing and custom fabrication. We include each company's headquarters, core products, key strengths, and what makes them worth considering.
Why Choosing the Right Flexible Duct Supplier Matters
Not all flexible duct is created equal. The differences between manufacturers show up in three critical areas:
Product quality and consistency. A well-made insulated flex duct maintains its R-value over time, resists tearing during installation, and holds its shape without sagging. Poor-quality duct develops condensation problems, loses insulation value, and degrades airflow — costing the building owner more in energy bills than the contractor saved on materials.
Certification and code compliance. Every flexible duct installed in the US must meet UL 181 standards. Beyond the baseline, GREENGUARD certification matters for schools and healthcare facilities. The latest IECC energy codes require R8 insulation in most climate zones — not every manufacturer offers a full R8 line across all diameters.
Availability and lead times. A manufacturer with four plants across the US can ship next-day to most markets. A single-plant operation or an import-only supplier may have 2-4 week lead times that stall your project. Distribution network depth — how many local wholesalers carry the brand — determines whether you can pick up product the same day or wait for a truck.
How We Evaluated These Manufacturers
We assessed each company across six criteria:
- Product breadth — range of duct types (insulated, non-insulated, acoustic, specialty), diameter sizes, and R-values offered
- Manufacturing footprint — number and location of US-based plants, production capacity, ability to handle large orders
- Quality certifications — UL 181, UL 2158A, GREENGUARD, SMACNA compliance
- Distribution reach — number of states served, wholesale distributor partnerships, retail availability
- Pricing and value — competitive pricing relative to quality, volume discounts, direct-purchase options
- Customer support — quote response time, technical support, custom order capability, warranty terms
The list is not ranked in strict order — the best manufacturer for your project depends on your specific needs, location, and volume. That said, we have organized them with the most broadly capable suppliers at the top.
The Top 10 Flexible Duct Manufacturers & Suppliers in the USA
1. ATCO Rubber Products
Headquarters: Fort Worth, Texas | Founded: 1961 | Website: atcoflex.com
ATCO is the worldwide leader in flex duct systems and the name most HVAC professionals associate with flexible ductwork. Established in 1961, ATCO has over six decades of manufacturing experience and operates plants across the US, Europe, India, and the Middle East — giving them unmatched production capacity and geographic reach.
Core Products: Complete line of UL 181-listed flexible air ducts for residential and light-commercial HVAC — insulated (R4.2, R6, R8), non-insulated, metalized, and specialty ducts. Their product range covers virtually every diameter from 4" to 20".
Key Strengths: Deepest distribution network in the industry — ATCO products are stocked by thousands of HVAC wholesalers across all 50 states. Their UL-listed products are the benchmark other manufacturers are compared against. If you need guaranteed availability and zero risk, ATCO is the default choice.
Considerations: Premium pricing reflects the brand's market position. Sold exclusively through distributors — no direct sales to contractors or end users.
2. JP Lamborn (JPL)
Headquarters: Fresno, California | Founded: 1961 | Website: jplflex.com
JP Lamborn is the oldest and largest family-owned flexible duct manufacturer in North America. Founded by Jack Lamborn in 1961 and now in its third generation under president Jason Lamborn, JPL operates four state-of-the-art manufacturing plants strategically located in California, Colorado, Tennessee, and Florida — providing coast-to-coast coverage with reduced freight costs.
Core Products: Full range of residential and commercial flexible air ducts — insulated (R4.2, R6, R8), non-insulated, and specialty products. JPL focuses on core flex duct rather than diversifying into industrial hoses or accessories.
Key Strengths: Four-plant US footprint means next-day delivery to most markets. Over 60 years of continuous flex duct manufacturing — their process efficiency is hard to match. Services HVAC distributor partners in 45+ states. Family ownership means long-term relationships and stability.
Considerations: Distributor-only sales channel. Product line is focused specifically on HVAC flex duct — if you need industrial hoses, PVC duct, or niche specialty products, you will need a second supplier.
3. USFlexDuct
Headquarters: Brookshire, Texas | Experience: 30 years | Website: usflexduct.com
USFlexDuct combines 30 years of flexible duct manufacturing expertise with a direct-to-contractor sales model that eliminates middleman markups. Based out of a 46,000 sq ft warehouse in Brookshire, TX (just west of Houston), USFlexDuct offers one of the broadest product lines in the industry — from standard aluminum flexible duct and R6/R8 insulated flex duct to specialized industrial hoses, PVC combi ducts, and duct connectors.
Core Products: 15+ product lines covering flexible ducts (aluminum, metalized polyester, PVC combi, semi-rigid), insulated ducts (fiberglass, polyester, R6/R8, acoustic/soundproof), industrial-grade hoses (nylon fabric, silicone, PU, PVC), and installation accessories.
Key Strengths: The direct sales model means contractors and smaller distributors get factory-level pricing without going through a chain of middlemen. Custom orders — non-standard diameters, special lengths, private-label packaging — are handled in-house with 24-hour quote turnaround. The engineering team designs and builds their own production equipment, which allows tighter tolerances and faster adaptation to custom specs than competitors relying on off-the-shelf machinery.
Considerations: Smaller distribution footprint compared to ATCO or JPL — best suited for projects in Texas and the southern US where warehouse proximity means fast shipping, or for bulk orders shipped nationally. Growing brand recognition.
4. Thermaflex
Headquarters: Dallas, Texas | Founded: 1966 | Website: thermaflex.net
Thermaflex has been manufacturing flexible duct products for over 60 years and is known for innovation in duct cleanliness and indoor air quality. Their patented EverClean technology — an antimicrobial inner liner that inhibits mold and bacteria growth — has made them the go-to choice for healthcare, education, and clean-room applications.
Core Products: M-KC EverClean flexible insulated duct, SLP high-velocity vinyl flexible duct, standard insulated flex duct (R4.2/R6/R8), and clean-room/medical-grade specialty ducts.
Key Strengths: Industry leader in antimicrobial and clean-air duct technology. Strong warranties — some products carry 10+ year coverage. SLP high-velocity duct approved for clean-room and dryer venting applications. Available through major distributors nationwide.
Considerations: Premium pricing, especially for the EverClean line. Overkill for standard residential tract housing where basic UL 181 flex duct is sufficient.
5. Flexmaster U.S.A.
Headquarters: Houston, Texas | Founded: ~1989 | Website: flexmasterusa.com
Flexmaster U.S.A., a product line of Masterduct, Inc., has over 35 years of success in the commercial HVAC flexible duct and sheet-metal fitting market. They are one of the few manufacturers offering both flexible ductwork and a full line of sheet-metal fittings, making them a one-stop source for commercial duct system components.
Core Products: Commercial and residential flexible ducts, acoustical ducts, sheet-metal fittings, access doors, low-leakage access doors, and accessories. Newer product lines include anti-microbial flexible duct and sheet-metal fittings designed for hospital patient rooms, operating rooms, MRI suites, and data centers.
Key Strengths: Industry-leading 20-year warranty — the longest in the HVAC ductwork industry. Unique adhesive-free manufacturing process (no glues in their flexible duct construction). Medical and environmental product line for mission-critical facilities. Combined flex duct + sheet metal fittings = fewer vendors for your project.
Considerations: Stronger in commercial than residential markets. Distribution is more regional (concentrated in the South and Southwest) compared to national players like ATCO or JPL.
6. Hart & Cooley
Headquarters: Grand Rapids, Michigan | Founded: 1901 | Website: hartandcooley.com
Hart & Cooley is one of the oldest names in American HVAC manufacturing, founded in New Britain, Connecticut in 1901. With over 125 years in the industry, they manufacture an extensive range of air distribution products under multiple brands including Hart & Cooley, Selkirk, AMPCO, and MILCOR.
Core Products: Flexible air duct systems, grilles, registers, diffusers, chimney and venting systems, commercial rooftop products, access doors, and air filtration systems. Their flex duct line covers standard insulated and non-insulated options for residential and commercial applications.
Key Strengths: The broadest overall HVAC product portfolio of anyone on this list — if you want one vendor for flex duct, registers, diffusers, venting, and access doors, Hart & Cooley can supply them all. Plants in the US, Mexico, and Canada. Extremely deep distribution network through established wholesaler relationships built over a century.
Considerations: Flexible duct is one product line among many — they are a generalist, not a flex duct specialist. If you need cutting-edge flex duct innovation (antimicrobial liners, high-velocity specialty products), a focused manufacturer may serve you better.
7. Quietflex Manufacturing
Headquarters: Houston, Texas | Founded: 1976 | Website: quietflex.com
Quietflex has been manufacturing flexible duct and fiberglass insulation products since 1976. They are a pure-play flex duct manufacturer — unlike diversified HVAC companies, Quietflex focuses entirely on flexible air duct and insulation, which shows in their product depth and manufacturing efficiency.
Core Products: AMGFlex, HPDFlex (commercial high-static-pressure), QAS Acoustical Flex Duct, Rip Stop Flex Duct, UV-Inhibited Flex Duct, and Mobile Home Flex Duct. All products feature Johns Manville Formaldehyde-free insulation and are GREENGUARD Certified.
Key Strengths: GREENGUARD certification across the entire product line — important for schools, hospitals, and green building projects targeting LEED credits. Four manufacturing facilities (Houston, Phoenix, Groveland FL, Pittston PA) provide good national coverage. Specialized products like UV-inhibited duct for exposed installations and rip-stop duct for rough handling conditions.
Considerations: Primarily focused on residential and manufactured housing markets. Commercial contractors may need their HPDFlex line, which has a more limited size range than competitors. Distributor-only sales.
8. Southwark Metal Manufacturing
Headquarters: Philadelphia, Pennsylvania | Founded: 1946 | Website: southwarkmetal.com
Southwark Metal has been manufacturing HVAC sheet metal products since 1946, making them one of the most established duct manufacturers on the East Coast. While primarily known for rigid sheet metal pipe and fittings, Southwark also manufactures aluminum flexible duct and has built a reputation for quality and reliability over nearly eight decades.
Core Products: Aluminum flexible duct, sheet metal pipe, duct fittings, and HVAC accessories. Their catalog includes over 3,000 sheet metal duct and fitting SKUs, plus flexible duct options.
Key Strengths: Strongest sheet metal duct manufacturer in the Northeast — over 500 distributors stock their products. If you are an East Coast contractor, Southwark is likely already on your wholesaler's shelf. Combining rigid duct and flex duct from a single vendor simplifies procurement. Nearly 80 years of manufacturing heritage.
Considerations: Flex duct is a secondary product line — their core strength is rigid sheet metal. Limited flex duct variety compared to pure-play manufacturers like ATCO or JPL. Distribution concentrated in the eastern US.
9. Master Flow (GAF)
Headquarters: Parsippany, New Jersey (GAF corporate) | Website: gaf.com
Master Flow is the flexible ductwork brand of GAF, North America's largest roofing manufacturer (a subsidiary of Standard Industries). While GAF's core business is roofing, their Master Flow line has become one of the most widely available retail flexible duct brands in the country, stocked at every Home Depot and Lowe's location.
Core Products: Insulated flexible duct (R6, R8), non-insulated flexible duct, duct connectors, and ventilation accessories. Available in standard residential sizes (4" through 14") and 25-foot lengths.
Key Strengths: The easiest flex duct to buy in America — available off the shelf at Home Depot, Lowe's, and major hardware retailers nationwide. Competitive retail pricing. UL 181 listed. Good option for homeowners doing DIY HVAC work, small contractors who buy at retail, or emergency same-day needs when your wholesaler is out of stock.
Considerations: Retail-oriented — professional contractors can usually get better per-unit pricing through wholesale distributors carrying ATCO, JPL, or other pro-grade brands. Limited size range compared to manufacturer-direct options. GAF is a roofing company — HVAC ductwork is not their core competency.
10. Dundas Jafine
Headquarters: Jacksonville, Florida (US operations) | Website: dundasjafine.com
Dundas Jafine is a North American manufacturer specializing in flexible duct, dryer venting, and bathroom ventilation products. Their products are widely available through both wholesale and retail channels, making them one of the most accessible brands for contractors and homeowners alike.
Core Products: Insulated flexible duct (R4.2, R6, R8), aluminum foil duct, semi-rigid dryer duct, dryer vent kits, bathroom fan vent kits, and ducting accessories. Their flexible insulated duct features a 2-ply polyester laminate inner core with zinc-coated wire helix.
Key Strengths: Strong in the dryer venting and bathroom ventilation niche — they offer complete kits (duct + clamps + wall cap + tape) that simplify installation. Competitive pricing. Available through Amazon, Home Depot, Lowe's, and HVAC distributors. Good product documentation and DIY-friendly installation guides.
Considerations: More of a venting and small-diameter specialist than a full-line HVAC flex duct manufacturer. If you need large-diameter commercial duct (14" and above), look to ATCO, JPL, or USFlexDuct.
Quick Comparison Table
| Manufacturer | Location | US Plants | Best For | Direct Sales? |
|---|---|---|---|---|
| ATCO Rubber Products | Fort Worth, TX | Multiple | Large-scale commercial & residential | No (distributor only) |
| JP Lamborn (JPL) | Fresno, CA | 4 | Coast-to-coast availability, fast delivery | No (distributor only) |
| USFlexDuct | Brookshire, TX | 1 | Direct pricing, custom orders, industrial hoses | Yes |
| Thermaflex | Dallas, TX | Multiple | Healthcare, clean-room, antimicrobial | No (distributor only) |
| Flexmaster U.S.A. | Houston, TX | 1 | Commercial projects, 20-year warranty | No (distributor only) |
| Hart & Cooley | Grand Rapids, MI | Multiple | Full HVAC product range, one vendor | No (distributor only) |
| Quietflex | Houston, TX | 4 | GREENGUARD, schools, green buildings | No (distributor only) |
| Southwark Metal | Philadelphia, PA | 1 | East Coast, sheet metal + flex combo | No (distributor only) |
| Master Flow (GAF) | Parsippany, NJ | Multiple | Retail availability, DIY, same-day pickup | Yes (retail) |
| Dundas Jafine | Jacksonville, FL | 1 | Dryer venting, bathroom fans, DIY kits | Yes (retail) |
How to Choose the Right Flexible Duct Supplier for Your Project
With 10 capable manufacturers serving the US market, the right choice depends on your specific situation. Here is a decision framework:
For Large Residential Builders & General Contractors
If you are building 50+ homes per year and need consistent supply with zero risk of stockouts, go with ATCO or JPL through your HVAC distributor. Their multi-plant footprint and deep distribution networks guarantee availability. Negotiate volume pricing through your distributor rep.
For Small-to-Mid Contractors Seeking Better Margins
If you are a 1-10 crew operation and tired of paying distributor markups, consider buying direct from USFlexDuct. Factory-direct pricing on insulated duct, flexible duct, and accessories means better margins on every job. The tradeoff is ordering in bulk versus grabbing individual boxes at a wholesaler.
For Healthcare, Schools, and Green Building Projects
Thermaflex (EverClean antimicrobial) or Quietflex (GREENGUARD Certified, formaldehyde-free) are the standout choices when IAQ certifications and low-emission materials are project requirements.
For Commercial Projects Needing Flex + Sheet Metal
Flexmaster U.S.A. or Hart & Cooley can supply both flexible duct and sheet-metal fittings from a single source, simplifying procurement and reducing vendor management overhead on large commercial jobs.
For DIY Homeowners and Emergency Repairs
Master Flow (at Home Depot/Lowe's) or Dundas Jafine (Amazon/Home Depot) for off-the-shelf availability. You can pick up a box of insulated flex duct and have it installed the same day.
For Industrial and Specialty Ducting
If your application goes beyond standard HVAC — dust collection, fume extraction, high-temperature environments, portable AC exhaust — USFlexDuct offers the broadest range of industrial hoses including nylon fabric duct hose, silicone duct hose, and PU flexible hose alongside standard HVAC flex duct.
Flexible Duct Industry Trends to Watch in 2026
R8 becoming the new baseline. The 2024 IECC energy code update, now adopted by a majority of states, requires R8 insulation for ducts in unconditioned spaces. Manufacturers without a full R8 product line across all diameters are losing market share. If you are still specifying R6 by default, check your local code — you may be installing non-compliant duct.
Antimicrobial and low-emission duct. Post-pandemic awareness of indoor air quality has driven demand for antimicrobial duct liners and formaldehyde-free insulation. Thermaflex's EverClean and Quietflex's GREENGUARD lines are leading this trend. Expect more manufacturers to introduce IAQ-focused products.
Direct-to-contractor sales models. The traditional manufacturer-to-distributor-to-contractor supply chain is being disrupted by suppliers who sell factory-direct. This shift — similar to what happened in building materials a decade ago — gives contractors access to better pricing and custom orders without the wholesaler markup.
Duct sealing and leakage standards tightening. ASHRAE 90.1 and new state codes are requiring duct leakage testing on more project types. This is driving demand for higher-quality duct connectors, sealing tape, and better-constructed flex duct that maintains air-tightness at joints.
Related Resources
- Flex Duct vs Metal Duct: Which Is Better for Your HVAC System?
- Flex Duct Installation Guide: Best Practices for Maximum Airflow
- R6 vs R8 Duct Insulation: Which R-Value Do You Need?
- Flex Duct Sizes Guide: How to Choose the Right Diameter
- Flex Duct CFM Chart: Airflow Capacity by Size
- Duct Connector Guide: Types, Sizes, and Installation
- Industrial Flexible Duct Guide