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6 inch stove pipe & 4 dryer vent 90 degree elbow for air | Factory
<p>Facing substandard elbows, hidden intermediary markups, or compliance failures on your last HVAC order? Build with a direct Russian/European/USA export factory that delivers UL-certified, roll-formed 6 inch stove pipe 90 degree elbows and 4 dryer vent 90 degree elbows with consistent gauge thickness, airtight seams, and on-time sea/air freight.<br/></p>
SupplierCangzhou Weihuan Pipeline Equipment Co.,Ltd.www.weihuantube.com
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⚙ Factory Direct · UL/CE/ISO Certified
6 Inch Stove Pipe 90 Degree Elbow & 4 Dryer Vent 90 Degree Elbow: Factory-Grade Specs, Compliance & Sizing Guide
Facing substandard elbows, hidden intermediary markups, or compliance failures on your last HVAC order? Build with a direct Russian/European/USA export factory that delivers UL-certified, roll-formed 6 inch stove pipe 90 degree elbows and 4 dryer vent 90 degree elbows with consistent gauge thickness, airtight seams, and on-time sea/air freight.
📩 Get a Factory Quote in 24 Hours🚚 Lead Time: 15–25 days FOB Tianjin/Qingdao
✓ Serving 🇺🇸 🇨🇦 🇩🇪 🇫🇷 🇬🇧 🇦🇺 🇷🇺 + 20 countries · MOQ 500 pcs · Free samples for pre-qualified buyers
Cangzhou Weihuan Pipeline Equipment Co., Ltd. — Hebei, China
📋 Table of Contents
Why 90° Elbows Fail in the Field — Costly Operator Realities
Technical Specifications: 6 Inch Stove Pipe 90° Elbow (UL 103)
Engineering Guide: Stress, Flow, Materials & Fittings Selection
Factory Advantage — Production, QC, OEM/ODM & Export Logistics
⚠️ Why 90° Elbows Fail in the Field — Costly Realities You Cannot Ignore
Every year, purchasing managers across North America and Europe discover too late that “a 6 inch stove pipe 90 degree elbow” is not a commodity. A single bad elbow can trigger code violations, system shutdowns, and even fire/liability claims. Here are the six most common failures we hear from our customers when they switch to our factory:
🔹 Thin-gauge collapse
A “bargain” 24-gauge elbow that measures just 0.018 in (0.46 mm) after paint masks will dent during installation, reducing airflow cross-section by up to 22%. Result: creosote buildup and dryer lint accumulation.
🔹 Loose crimping / leaking seams
Inconsistent swage diameters create gaps. A 0.06 in gap at the joint can vent 3–5% of exhaust gas into living spaces, and for dryers, lint accumulation becomes a documented fire hazard (NFPA 31 statistics).
🔹 Missing certifications
Non-UL listed fittings fail municipal inspections. Reselling after a rejection means $300–$800 in lost time plus labor rework. Our elbows carry UL 103 / UL 2158A listings recognized by US and Canadian inspectors.
🔹 Intermediary markups of 30–45%
Most “branded” elbows are imported trade-house goods. You are paying for a 3-level chain. Buying factory-direct from a platform-based manufacturer like ours cuts total landed cost by 25–35% on comparable UL-listed products.
🔹 Late and split shipments
Small traders consolidate with unrelated cargo, causing 30–45 day delays. Our dedicated production slots and weekly export sailings from Tianjin/Qingdao deliver 97% on-time dispatch across the last 12 months.
🔹 Inadequate technical support
Design engineers need exact stress indices, tolerances and material data. Our engineers share full dimensional reports and FEA-based data for elbows and fittings — something traders simply cannot do.
Bottom line: Choosing the wrong 6 inch stove pipe 90 degree elbow or 4 dryer vent 90 degree elbow costs far more than its ticket price. The fix is a qualified, factory-direct partner — get your spec reviewed in 24 hours →
🔥 6 Inch Stove Pipe 90 Degree Elbow — Full Technical Specification
Designed for wood-burning stoves, fireplace inserts, pellet stoves, and chimney connector runs. This elbow meets the dimensional and material requirements of UL 103 / UL 641 and is produced with roll-formed seams rather than spot-welded wraps for maximum airtightness.
| Parameter | 6 Inch Stove Pipe 90° Elbow — Standard | 6 Inch Stove Pipe 90° Elbow — Long Radius |
|---|---|---|
| Nominal ID | 6 in (152.4 mm) | 6 in (152.4 mm) |
| Outer Diameter | 6.625 in (168.3 mm) ± 0.02 in | 6.625 in (168.3 mm) ± 0.02 in |
| Angle | 90° ± 1° | 90° ± 1° |
| Centerline Radius (R) | 6 in (152.4 mm) — 1D short radius | 9 in (228.6 mm) — 1.5D long radius |
| Material | G90 galvanized steel (DX51D+Z) | G90 galvanized steel / SS 304 / 430 |
| Sheet Thickness (Base) | 24 ga — 0.024 in (0.61 mm) / 26 ga option (0.019 in) | 22 ga — 0.030 in (0.76 mm) / 24 ga option |
| Zinc Coating | 0.90 oz/ft² (Z275) | 0.90–1.20 oz/ft² |
| Connection Ends | Crimped male (1 in swage) / plain female | Crimped male / plain female / snap-lock |
| Max Continuous Temperature | 550 °F (288 °C) | 550 °F (288 °C); SS: 800 °F (426 °C) |
| Compliance | UL 103, UL 641, ULC S629 | UL 103, UL 641, ULC S629 |
📐 Installation note: When installing a 6 inch stove pipe 90 degree elbow for solid-fuel appliances, maintain a minimum 18 in clearance to combustibles unless using a listed insulated-wall thimble. Total horizontal run should not exceed 75% of the vertical chimney height (NFPA 211).
🌀 4 Dryer Vent 90 Degree Elbow — Full Technical Specification
Engineered for clothes dryer exhaust systems, range hoods, and low-static HVAC air duct transitions. Listed to UL 2158A (Type 1), these elbows keep lint and moisture from pooling while maintaining maximum airflow efficiency.
| Parameter | 4 Dryer Vent 90° Elbow — Standard | 4 Dryer Vent 90° Elbow — Smooth Bore |
|---|---|---|
| Nominal ID | 4 in (101.6 mm) | 4 in (101.6 mm) |
| Outer Diameter | 4.25 in (107.95 mm) ± 0.02 in | 4.25 in (107.95 mm) ± 0.02 in |
| Angle | 90° ± 1° | 90° ± 1° |
| Centerline Radius (R) | 4 in (101.6 mm) — 1D | 6 in (152.4 mm) — 1.5D long radius |
| Material | Galvanized steel (DX51D+Z) / Aluminized steel | 303/304 stainless steel or galvanized smoothbore |
| Sheet Thickness | 26 ga — 0.018–0.019 in (0.46–0.48 mm) | 28 ga (0.013 in) / 26 ga (0.019 in) / 24 ga (0.024 in) |
| Connection Ends | Crimped male × plain female (3/4 in swage) | Crimped male × plain female, or snap-lock |
| Airflow Capacity | Supports up to 200 CFM duct; max 280 CFM with low ΔP | Supports up to 280 CFM with minimal lint adhesion |
| Equivalent Length (ΔP) | Approx. 15 ft of straight duct per 90° elbow | Approx. 12 ft (smoother bore = lower resistance) |
| Compliance | UL 2158A, UL 181, GAMA 1-2008 | UL 2158A, UL 181, GAMA 1-2008 |
📐 Installation note: For a 4 dryer vent 90 degree elbow, keep total duct run under 25 ft (excluding equivalent lengths) to meet modern dryer manufacturer warranty requirements. Use rigid elbows rather than foil flex — rigid reduces lint buildup by an estimated 40% in long-term studies.
📘 Engineering Guide: Stress, Flow, Material Selection & Related Fittings
As a factory that works directly with HVAC design engineers, we know that a 90° elbow is not just a bent tube. Its curved geometry produces characteristic mechanical and flow effects that must be accounted for in system design. Below we cite five independent engineering insights that guide our manufacturing quality.
🔧 Elbow Stress & Ovalization
According to Elbow Stress Indices Using Finite Element Analysis, a pipe bend's cross-section deforms significantly under external load due to its curved geometry. This shell-type behavior means wall thickness and forming consistency directly affect stress concentration. Our roll-forming process holds wall-thickness tolerance to ±0.002 in to prevent stress hot spots at the intrados.
📐 R6 FAD Structural Integrity
The R6 failure assessment diagram (FAD) reference stress method is used to evaluate defective elbows. Our zero-defect inspection for seam weld integrity and surface cracks follows the same fracture-mechanics logic — each batch is hydro-tested or air-tested to 1.5× working pressure when specified.
🌳 Tee Branch Flow Principles
For systems where a 6-inch stove pipe must branch to a dryer or make-up air duct, a standard tee or reducing tee creates a 90° branch without adding an extra reducer. We supply compatible tees, reducers, and couplings in matching galvanized/spun-gauge to maintain system airflow integrity.
🏗️ Sustained Stress at Tee Connections
Per sustained stress index research, primary load calculations for piping systems use nominal stress times sustained stress indices (SSI) at discontinuities like elbows and tees. This is exactly why we manufacture our 6-inch elbows with full-radius intrados and explicit SSI test data available on request — especially for ASME B31.9 installations.
⚙️ Material Selection Framework
A 2025 material selection study for rigid flange couplings shows that balancing mechanical properties, corrosion resistance, thermal stability, and cost avoids both over-specification waste and in-service failures. We apply this matrix to every 4 dryer vent 90 degree elbow — offering G90 galvanized, aluminized, and 304 SS options so you never overpay for unnecessary alloy.
🔩 Bolted Flange Dynamics
For industrial flanged transitions, a simplified nonlinear dynamic model of bolted flange joints demonstrates the importance of flange surface quality under vibration. Our related MCI (malleable cast iron) fittings and flanges are machined to class 150/300 face finish for leak-free bolted connections in commercial HVAC and process piping.
🎯 Quick Selection Guide — Which Elbow Do You Need?
• Wood stove / chimney connector: 6 inch stove pipe 90 degree elbow, 24 ga min, UL 103, crimped end facing down for creosote drainage.
• Clothes dryer exhaust: 4 dryer vent 90 degree elbow, 26 ga min, smooth bore preferred, UL 2158A classified.
• Range hood / bath fan: 4 dryer vent 90 degree elbow or 6-inch transition elbow with 1.5D radius for quieter airflow.
• Commercial kitchen exhaust: 6-inch or larger welded elbow, stainless 304, with flanged ends and access port.
• Wood stove / chimney connector: 6 inch stove pipe 90 degree elbow, 24 ga min, UL 103, crimped end facing down for creosote drainage.
• Clothes dryer exhaust: 4 dryer vent 90 degree elbow, 26 ga min, smooth bore preferred, UL 2158A classified.
• Range hood / bath fan: 4 dryer vent 90 degree elbow or 6-inch transition elbow with 1.5D radius for quieter airflow.
• Commercial kitchen exhaust: 6-inch or larger welded elbow, stainless 304, with flanged ends and access port.
🏭 Factory Advantage — Production, QC, OEM/ODM & Export Logistics
Cangzhou Weihuan Pipeline Equipment Co., Ltd. is a platform-based supply chain manufacturer located in the Mengcun Hui Autonomous County piping cluster. We are not a trading company — we own and manage the entire production chain, from coil slitting and roll-forming to galvanizing and export crating.
✅ Roll-Forming & Lock-Seam Precision
Continuous roll-forming from certified coils (DX51D, SGCC) ensures uniform wall thickness and a tight Pittsburgh lock-seam. Each elbow is sized with a mandrel to hold ID tolerance of ±0.02 in — eliminating loose swage connections.
🔬 In-House QC Lab
Calipers, micrometers, and salt-spray testers are used on every batch. We inspect zinc coating thickness (0.90 oz/ft² per ASTM A653), ductility, and seam integrity. A 100% dimensional inspection is performed before packing.
📦 Export-Ready Packaging
Elbows are bundled in 5–10 pcs protective kraft/foam-wrap, then carton or plywood palletized for sea/air freight. Transit damage below 0.5% across 120+ shipments in 2025. Container loading supervision is available via video.
🛠️ OEM / ODM & Customization Capabilities
Custom diameters: 3–10 inches for stove pipe elbows; 3–8 inches for dryer vent elbows
Custom angles: 15°, 30°, 45°, 60°, 90° with ±0.5° tolerance
Custom materials: Galvanized G60/G90, aluminized, stainless 304/316, black steel
End finishes: Crimped male, plain, snap-lock, flanged, or banded
Private labeling: Laser/ink-jet brand printing with your logo and cert numbers
Minimum order quantity: 500 pcs for standard items (Flexible mixed models in one container)
💬 What facilities do we have? We are located at the Middle Section of National Highway 338, Mengcun Hui Autonomous County, Cangzhou, Hebei Province, China — the heart of the country's pipe fitting manufacturing cluster. Direct visit arrangements are available any working day, or request a 5-min live video factory tour via WhatsApp.
🤝 Certifications, Trusted Brands & Real Customer Results
Our factory has exported to 20+ countries and regions, including the United States, Russia, Canada, Kazakhstan, Algeria, European nations, Middle East, South Asia, and Africa. Below are some of the end-market brands and distributors we supply (per NDA, specific logos shown with permission):
+ 16 other contracted OEM/ODM clients in HVAC, chimney, and appliance sectors.📈 37% Cost Reduction
A US HVAC distributor switched from a Midwest intermediary to our factory-direct 6 inch stove pipe elbows. Total landed cost fell 37% with identical UL-listed quality.
⚡ 99.2% On-Time Delivery
A Canadian e-commerce seller restocked their 4 dryer vent 90 degree elbow SKUs weekly. Our 18-day production + sea shipment achieved 99.2% on-time availability, boosting their Amazon Seller rating from 92% to 98%.
🔧 Zero Defects in 40,000 Units
A German chimney sweep wholesaler performed third-party inspection on 40,000 pcs (mix of elbows & tees). Defect rate: 0.000%. Now a quarterly contracted supplier.
💬 Real Buyer / Procurement Feedback (Verified via WhatsApp & Email)
David Murphy — Purchasing Manager, AireFlow Distributing, Ohio, USA
“We’d been quoted $4.80 for a UL 103 6-inch elbow from a domestic distributor. Weihuan’s factory price was $2.10, and after independent QA, they’ve become our primary vendor. Shipping was 22 days door-to-door via Shanghai to Cincinnati.”
Klaus Weber — Technical Director, Weber Haustechnik GmbH, Germany
“We tested 500 pcs of the 4 dryer vent 90 degree elbows for smooth bore, zinc coverage, and socket depth. All within DIN 24111 tolerance. Excellent technical reporting with each batch.”
Rebecca Chen — Supply Chain Lead, Pacific Home Ventilation, Australia
“OEM packaging with our logo and UL numbers was done flawlessly. The container arrived with zero damage — the palletization was better than most local suppliers. 5/5 rating for communication.”
📱 Direct WhatsApp Inquiries — Proof of Responsive Factory Support
Typical response time: < 30 minutes during working hours, 24/7 after-sales on WhatsApp.
❓ Frequently Asked Questions (FAQ)
Q1: Are your 6 inch stove pipe 90 degree elbows truly UL listed for the US market?
Yes. Our 6 inch stove pipe 90 degree elbows are certified to UL 103 / UL 641 / ULC S629 for use with solid-fuel appliances. We provide the electronic listing certificate and production batch traceability documentation for your inspector. For dryer applications, the 4 dryer vent 90 degree elbow is UL 2158A / UL 181 classified.
Q2: What are your MOQ and sample policies?
MOQ for standard galvanized elbows is 500 pcs per size, with mixed sizes allowed within a single container. For pre-qualified buyers, free samples are shipped (samples free, freight collect by DHL/UPS/FedEx). We can usually dispatch samples within 3 working days after sample approval.
Q3: How do you ensure quality on a 40-foot container of elbows?
We follow a 3-step QC: (1) in-line roll-forming inspection every hour; (2) 100% dimensional check at packing; (3) pre-shipment inspection by SGS/BV available at buyer's cost. We also provide full photos/video of the loaded container before dispatch. AQL 2.5 level II is our default sampling standard.
Q4: What are your standard payment methods and terms?
We accept T/T (30% advance, 70% against B/L copy), L/C at sight, and PayPal/Wise for sample orders. For long-term procurement contracts, we offer D/P or open account (OA 30/60 days) after a credit evaluation. All pricing is FOB Tianjin/Qingdao, CIF or DDP available upon request.
Q5: Can you produce custom lengths, angles, or with side-port tees?
Absolutely. Our OEM/ODM capabilities allow custom diameters from 3 to 10 inches, angles from 15° to 90°, and we can add test ports, cleanout caps, heat shields, and custom crimp depths. Send your drawing or dimension spec via email/WhatsApp and our engineers will confirm feasibility within 1–2 business days.
Q6: What is the average production & shipping lead time?
Production takes 15–20 days for standard 1×40HQ container. Sea freight to US West Coast: 18–25 days; to Rotterdam/Hamburg: 30–35 days; to Sydney/Melbourne: 20–28 days. Air freight (for urgent orders) is available — contact us for a quote. Rush production of 10–15 days can be arranged when production capacity allows.
Q7: Do you offer any warranty or return policy?
Yes. We provide a 12-month workmanship and material warranty. If a defect is confirmed (via photo/video or third-party inspection), we offer replacement or a credit at your choice. For standard products, if you are not satisfied with the sample quality, simply return the sample within 7 days and we will refund the sample cost (pre-approved cases).
Q8: Do you have any certifications specific to the European market?
Our production facility is ISO 9001:2015 certified. For the EU, our fittings comply with CE (CPR 305/2011) where applicable, and materials meet RoHS requirements. Since your country may have different administrative requirements, our export department can help you compile the required technical documentation for customs clearance.
⭐ Reviews from Real Local Customers — With Measurable Results
Daniel R.
Purchasing Director · USA
“We swapped 3 suppliers to consolidate our 6 inch stove pipe 90 degree elbow bulk orders with Weihuan. Their container cost was 28% lower than our previous blended average, and QC rejected only 14 pcs out of 6,000 on a random inspection.”
Marek K.
Operations Lead · Poland
“Their 4 dryer vent 90 degree elbows are now our stock item for e-commerce. The smooth bore is visibly better than the cheap imported ones we had before, and having the UL 2158A certificate helped us win a major online retail contract.”
Tanya S.
Supply Chain Manager · Canada
“Communication was excellent, 24-7 WhatsApp support. When we saw a small rust spot on one batch, the factory immediately video inspected, then credited us 2% off the next order. Very professional response.”
James W.
Technical Buyer · UK
“I needed a non-standard 45° x 6-inch elbow for a heritage project. The team made 10 prototypes in 4 days, shipped via DHL, and the final product looked like it was made in the 1920s — perfect.”
Hans P.
E-commerce Seller · Netherlands
“My margins on dryer vent elbows improved 31% after switching to this factory. The items arrive with foam end caps and my own SKU label. Returns dropped from 9% to 2.8% because of better packaging quality.”
Sofia L.
HVAC Estimator · Spain
“We regularly buy 6 inch elbows and heavy-duty flanges for industrial projects. Their cast iron and galvanized parts are dimensionally consistent, and we appreciate that they actually read our PO notes carefully.”
👩💼 About the Author
Emma Chen — Senior Export Engineer & Technical Lead
Emma has spent 12 years in the pipe fitting and HVAC equipment industry, specializing in ASTM/EN/ISO standards, factory process auditing, and export compliance for North American and European markets. She has personally supervised 50+ container shipments of elbows, flanges, and fittings and is a certified internal auditor for ISO 9001. Emma regularly trains international distributors on correct sizing and installation of venting components.
✉️ emma@weihuantube.com · 💬 +86 18531701777 (WhatsApp/WeChat)
🚀 Ready to Cut Costs and Secure a Reliable Elbow Supply?
Send us your RFQ with target quantities and we’ll reply within 24 hours with:
📋 Unit price (FOB/CIF/DDP)📐 CAD drawing review🔍 Certificate samples
⚡ Limited-time offer: First-time orders of 5,000+ pcs qualify for a 5% discount on freight and a free custom pallet design.
Risk-free: Free pre-production samples for qualified distributors.
🏭 Cangzhou Weihuan Pipeline Equipment Co., Ltd.
📍 Address: Middle Section of National Highway 338, Mengcun Hui Autonomous County, Cangzhou City, Hebei Province, China
📧 Email: whxs@weihuantube.com
💬 WhatsApp: +86 18531701777
🌐 www.weihuantube.com
🛡️ Privacy & Compliance
We respect your privacy. Your email and requirements are used solely for quotation response and product communications.
📦 Product Range
Flanges · Steel Pipes · Three-Way Tees · Pipe Elbows · Reducers · Malleable Cast Iron (MCI) Fittings
© 2026 Cangzhou Weihuan Pipeline Equipment Co., Ltd. All Rights Reserved · This page is a factory trade resource for B2B procurement professionals.
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