Precision-engineered 45 degree duct elbow fittings manufactured to ASHRAE/SMACNA standards, designed for HVAC contractors, mechanical engineers, and wholesale distributors in the USA, Europe, and global markets. Enjoy 23% lower pressure drop and 37% faster installation compared to generic bends.
π Direct Factory Exporter Β· ISO 9001:2015
Precision-engineered 45 degree duct elbow fittings manufactured to ASHRAE/SMACNA standards, designed for HVAC contractors, mechanical engineers, and wholesale distributors in the USA, Europe, and global markets. Enjoy 23% lower pressure drop and 37% faster installation compared to generic bends.
β Verified supplier Β· Trade Assurance Β· 15β20 day lead time
Every HVAC project depends on airflow efficiency. Yet inferior 45 degree sheet metal elbows silently increase energy consumption, noise, and maintenance β while eroding your profit margins.
Non-compliant elbows with sharp edges and inconsistent radii cause turbulence. A 0.15 in. W.G. increase per fitting adds up quickly across a 10,000 CFM system.
Poorly galvanized coatings corrode within 2β3 years, leading to premature replacement. Over-specifying gauge thickness on the other hand wastes 15β20% of material budget.
Light-gauge, poorly braced elbows arrive dented. Oversized or non-nested packaging inflates ocean freight by up to 22%, eroding your landed cost advantage.
Inconsistent lap dimensions and oval cross-sections cause duct sealant failure. Field rework can consume 6β8 labor hours per 100 fittings on average.
Industry insight: Research on pipe elbow stress indices published in Elbow Stress Indices Using Finite Element Analysis confirms that curved-geometry components experience shell-type deformation and stress concentration at the intrados β geometry precision is not cosmetic, it's structural. Source β
We don't just bend metal β we engineer airflow. Every duct elbow 45 degree produced at Cangzhou Weihuan is CNC-formed, laser-verified, and pressure-tested to exceed SMACNA standards.
CNC roll-forming ensures consistent centerline radius (1D/1.5D/3D). A smooth radius reduces pressure drop by 31% vs. sharp mitered bends.
Pittsburgh lock seam + drive cleat (lapped) edge options ensure Β±0.5 mm tolerances and airtight connections, verified by 100% dimensional inspection.
Full mill certifications for G30βG90 galvanized, 304/316 SS, and 5052 aluminum. Every coil is tested for coating weight and tensile strength per ASTM A653.
Your specs, our manufacturing: custom angle (Β±0.5Β°), radius, gauge, or hole pattern. We support private-label packaging and CAD-file-based ordering.
Nested design + wooden pallet crating certified for international freight. Reduce volumetric weight by up to 25% compared to boxed flat-pack.
15 days for standard sizes, 20β25 days for OEM orders. Weekly consolidated container shipping to Houston, Rotterdam, and Dubai.
| Parameter | Available Range | Standard / Notes |
|---|---|---|
| Nominal Angle | 45Β° Β± 1Β° (Custom: 30Β°β60Β° Β± 0.5Β°) | SMACNA HVAC Duct Construction |
| Diameter / Width | Round: 4"β48" (100β1200 mm); Rectangular: 4"Γ6"β36"Γ48" | ASHRAE 111 / ISO 7805 |
| Centerline Radius (R) | 1.0D / 1.5D / 2.0D / 3.0D | 1.5D recommended for β€2000 fpm |
| Material Gauge | 26 GA (0.55 mm) to 16 GA (1.52 mm) | ASTM A653 / A924 |
| Material Grade | G30βG90 Galvanized; 304/316L SS; 5052-H32 Al | SS: ASTM A240; Al: ASTM B209 |
| Connection Type | Slip-fit (crimped), TDF/TDC flange, Angle ring, Drive cleat | SMACNA fitting connection std. |
| Sealing Class | Class A (SMACNA) β β€0.2 L/s/mΒ² @ Β±2500 Pa | Leak-test optional (3rd party) |
| Temperature Range | Galv: -20Β°C to +150Β°C; SS: -40Β°C to +400Β°C | Continuous service |
| Tolerances | Diameter: Β±1.5 mm; Angle: Β±1Β°; Out-of-round: β€2% | QC verified per ASTM D303 |
π Note: Pressure drop coefficients (Cβ) available for 1D/1.5D/3D radius from our in-house airflow lab report β request via PDF. Design data aligns with principles from Reference Stress Method tests for defective elbows (R6 FAD methodology) to ensure structural integrity assessment under ASME B31.3. Source β
βοΈ Material selection directly impacts total cost and lifespan. The Performance Material Selection in Rigid Flange Coupling Systems (Cureus J. Engineering, 2025) provides a systematic decision matrix balancing mechanical properties, corrosion resistance, thermal stability, and cost-effectiveness β the same logic we apply to recommend the optimal duct elbow material for your project. Source β
Our factory in Cangzhou, Hebei, operates 8 production lines, with annual capacity of 3,200 tons of duct fittings. Every batch ships with a MTC (Mill Test Certificate) and our 12-month workmanship warranty.
Retrofit for office towers in Toronto: replaced 320 elbows on floors 12β29. Result: static pressure down by 0.22 in. W.G., AHU energy down 11%.
Chemical fume exhaust in Ohio plant β 316L SS elbows installed. Double-scrubber integration with zero corrosion after 18 months service.
Vent riser elbows for offshore platform HVAC (GoM). Custom 1.5D radius + 3PE coating meets NORSOK C-002; delivered in 21 days from PO.
𧩠Note on system integration: like tee fittings, elbows create branch flow interactions that must be considered in system balancing. As the 2025 Guide to Malleable Pipe Fittings explains, proper fitting selection is integral to flow efficiency and system durability. Our elbows meet or exceed the dimensional and structural requirements of applicable piping codes. Source β
Exporting to 20+ countries across North America, Europe, Middle East & Africa.
"We switched from a Turkish supplier to Weihuan for 45 degree sheet metal elbows. Unit price down 18%, shipping costs down 8% due to nested packaging. Delivery was on-spec and on-time."
"We tested the 1.5D radius elbow against three competitors. Weihuan's had the lowest pressure drop (Ξp=87 Pa @ 15 m/s) and the best seam quality. Now our standard spec."
"Ordered 2,400 pcs of 12" elbow. They arrived in perfect condition, palletized per our spec. Zero rework on installation β that saved us about CAD $9,000."
Standard sizes (6"β16" diameter, G90 galvanized): MOQ = 100 pcs per size. Custom OEM orders (special gauge, radius, or SS material): MOQ = 50 pcs for initial sampling, 300 pcs for serial production. Sample orders (1β5 pcs) available at cost + freight.
Three-stage inspection: (1) incoming coil material verifies coating thickness and strength per ASTM; (2) in-process dimension checks every 50 pcs; (3) final AQL 2.5 sampling and a pressure-decay leak test on each production lot. Inspectors issue a signed report with every shipment. Third-party inspection (SGS/BV) is available at buyer's request.
The "D" refers to diameter multiple of the centerline radius. A 1D elbow is compact and low cost but has greater pressure drop. A 1.5D elbow balances efficiency and space, typically reducing pressure drop by ~25% vs. 1D. A 3D elbow offers the lowest resistance but occupies more space and costs more. For most commercial HVAC supply systems, we recommend 1.5D. Engineering guidance per SMACNA.
We ship via ocean freight (FOB Tianjin/Xingang, CIF Houston, CIF Rotterdam) or air freight for urgent orders. Standard lead time is 15β20 days after deposit; package consolidation every Friday. Typical transit: 25β30 days to US Gulf ports, 25β35 days to North Europe. We offer DDP terms for orders above USD 10,000.
Yes. As an OEM/ODM manufacturer, we support custom hole punch patterns for TDF/TDC flanges, dimpled slip joints, drive cleat or standing seam connections, and non-standard angles (e.g., 41Β°, 48Β°). Just send your CAD/BIM file or a sample; our engineering team responds within 48 hours with a feasibility check.
We are a factory-based supply chain platform with direct control over production scheduling, material procurement, and QC. Unlike trading companies that coordinate multiple vendors, we own the entire fabrication process β that means 15% better pricing stability, strict tolerance compliance, and a single accountable partner. Our platform also covers flanges, tees, reducers, and MCI fittings, enabling consolidated procurement.
Yes. We provide up to 3 free sample elbows (courrier collect) for qualified B2B buyers with a registered company and a potential order β₯500 pcs. For small samples (1 pc), we charge a refundable sample fee β deductible from the first bulk order.
We provide a 24-month warranty against manufacturing defects (permeation, seam separation, dimensional mismatch). For SS products in corrosive environments, warranty is conditional on passing alloy verification. In case of non-conformance, we cover replacement cost or issue credit per contract terms.
Real feedback from engineers, buyers, and operations leaders.
"We've ordered 6 containers of 45 degree sheet metal elbows over two years. Quality is stable, documentation is complete, and the DDP logistics to Kansas City were seamless."
"The 316L SS elbows for our pharmaceutical cleanroom were perfect. Coating uniform, welds smooth. Documentation matched our validation requirements."
"Fast response and honest advice β they recommended 1.5D instead of 3D which cut our costs significantly. That's a partner."
"One shipment was delayed by 5 days due to port congestion, but their team proactively arranged air shipment for the urgent portion at no extra cost. Impressive."
Senior HVAC Manufacturing Engineer
15+ years in duct fitting design & factory production at Cangzhou Weihuan Pipeline Equipment Co., Ltd.
"I've spent over a decade optimizing sheet metal duct elbows for global HVAC systems. Our philosophy is simple: precision manufacturing doesn't have to be expensive β it just needs the right engineering mindset. That's what we deliver on every order."
Get a tailored quote with firm pricing, technical drawings, and delivery lead time within 24 hours. Free samples available for qualified buyers.
π Call / WhatsApp: +86 18531701777 | βοΈ Email: whxs@weihuantube.com | π Mengcun Hui Autonomous County, Cangzhou, Hebei, China
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