Brookshire, TX 77423·46,000 sq ft in stock·Ships 1–15 business days
sarielhu7@gmail.com·+1-346-827-6702
USFlexDuct

Flexible Ducts

Our complete range of non-insulated flexible ducting solutions for HVAC, ventilation, and air distribution. Manufactured with precision spiral wire cores for maximum airflow and durability.

UL 181 Class 1 compliant3" to 24" diameter rangeCorrosion-resistant materialsEasy installation with clampsFlexible bend radiusStandard 25ft lengths

Available Models (7)

Aluminum Flexible Duct

Aluminum Flexible Duct

Multi-ply aluminum foil flexible duct with galvanized steel wire helix. The industry standard for residential and light commercial HVAC installations. Excellent for supply and return air distribution.

MaterialMulti-ply aluminum foil
CoreGalvanized steel wire helix
Diameter Range3" – 24" (75mm – 600mm)
DetailsGet a Quote
Metalized Polyester Flexible Duct

Metalized Polyester Flexible Duct

Lightweight metalized polyester film flexible duct with steel wire helix. Cost-effective alternative to full aluminum ducts. Ideal for residential HVAC and dryer exhaust applications.

MaterialMetalized polyester film
CoreSteel wire helix
Diameter Range3" – 24" (75mm – 600mm)
DetailsGet a Quote
Polyester Flexible Duct

Polyester Flexible Duct

Black polyester fabric flexible duct with steel wire helix. Durable and lightweight for general ventilation and HVAC applications. UV-resistant for semi-outdoor installations.

MaterialPolyester fabric
CoreSteel wire helix
Diameter Range3" – 24" (75mm – 600mm)
DetailsGet a Quote
Semi-Rigid Duct (Aluminum)

Semi-Rigid Duct (Aluminum)

Heavy-gauge semi-rigid duct in aluminum that holds its shape after bending. This semi rigid aluminum duct delivers superior airflow performance with minimal pressure drop. Ideal for dryer vents, range hoods, and tight spaces.

MaterialSemi-rigid aluminum alloy
ConstructionCorrugated aluminum tube
Diameter Range3" – 12" (75mm – 300mm)
DetailsGet a Quote
PVC Combi Flexible Duct

PVC Combi Flexible Duct

PVC-coated combination flexible duct with aluminum inner layer and PVC outer jacket. Chemical-resistant and moisture-proof for humid environments and commercial applications.

MaterialPVC outer + aluminum inner
CoreSteel wire helix
Diameter Range3" – 24" (75mm – 600mm)
DetailsGet a Quote
Non-Insulated Flexible Air Duct

Non-Insulated Flexible Air Duct

Non-insulated flexible air duct engineered for all positive-pressure supply and return air HVAC systems. Featuring a spiral galvanized steel wire core with a durable, abrasion-resistant outer layer and smooth crimped ends for fast, airtight connections. Manufactured at our Houston, TX facility with proprietary production processes — delivering exceptional flexibility, easy installation, and reliable long-term performance for both residential and commercial applications.

MaterialMulti-layer polyester film with aluminum coating
CoreGalvanized steel wire helix
Outer LayerAbrasion-resistant reinforced polymer
DetailsGet a Quote
PVC Steel Wire Duct

PVC Steel Wire Duct

Clear or colored PVC duct reinforced with embedded steel wire helix. Transparent wall allows visual inspection of airflow. Popular for dust collection and light material transfer.

MaterialPVC with steel wire helix
Diameter Range3" – 24" (75mm – 600mm)
Temperature Range-20°C to +100°C (-4°F to +212°F)
DetailsGet a Quote
In Stock — Ships 1–15 Days
UL 181 Class 1 Standard
30 Years in HVAC Duct
Houston, TX — 46,000 sq ft
FTL / LTL Freight Available

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Frequently Asked Questions

What diameter flex duct do I need for my HVAC system?
The correct flexible duct diameter depends on the CFM (cubic feet per minute) airflow required. As a general guide: 4" flex duct handles about 40–60 CFM, 6" handles 100–120 CFM, 8" handles 160–200 CFM, 10" handles 275–350 CFM, and 12" handles 400–525 CFM. We offer flexible air duct from 3" to 24" to cover residential and commercial needs. For exact sizing, refer to our flex duct CFM chart or flex duct sizes guide.
How long can a flex duct run be before airflow drops?
HVAC industry best practice limits flex duct runs to 25 feet maximum, and shorter is always better. Every extra foot adds friction loss — flex duct has roughly 50% more friction than rigid duct of the same diameter. Keep runs as short and straight as possible, avoid sharp bends, and pull the duct fully taut. Runs over 14 feet should be upsized one diameter. See our flex duct installation guide for detailed best practices.
What is the difference between aluminum and polyester flexible duct?
Aluminum flexible duct uses multi-ply aluminum foil and handles temperatures up to +120°C (+248°F), making it the industry standard for supply and return air. Polyester flexible duct is lighter and more budget-friendly, rated to +100°C (+212°F), and works well for general ventilation. Aluminum is preferred where fire rating matters (UL 181 Class 1), while metalized polyester is popular for high-volume residential projects. We also offer PVC combi ducts that combine both materials for moisture-resistant applications. Compare options in our flex vs rigid duct guide.
Can HVAC flex duct be used for dryer venting?
Standard aluminum foil flex duct should NOT be used for dryer venting — building codes require semi-rigid or rigid metal duct for dryer exhaust because lint buildup in flexible walls creates a fire hazard. Our semi-rigid aluminum duct (rated to +400°C / +752°F, UL 2158A listed) is specifically designed for dryer venting. It holds its shape after bending and has a smooth interior that resists lint accumulation. Check our dryer duct guide for code requirements.
Are your flexible ducts UL listed and code-compliant?
Yes. Our aluminum and metalized polyester flexible ducts are UL 181 Class 1 listed for use in air duct systems. Our semi-rigid aluminum duct carries UL 2158A listing for dryer venting. All products meet or exceed ICC/IECC mechanical code requirements. We provide UL test reports and compliance documentation with every bulk order. With 30 years of manufacturing experience and a warehouse in Houston, TX, we ensure every product meets North American standards.
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