Auto Duct Line 3 AML-3
Last updated: October 14, 2026
Mid-range auto duct line 3 (AML-3) for coil-fed rectangular duct with beading, notching and shear cutting. Folding and seam closing are typically performed manually or with separate machines — ideal for shops producing 2,000-5,000 m² of duct per month.
Technical Specifications
What is a Auto Duct Line 3 AML-3?
Auto Duct Line 3 (AML-3) is the mid-range PREDA rectangular duct line. It takes coil through decoiling, leveling, beading, notching and shear cutting, producing finished blanks at volume — with folding and seam closing done manually or on separate machines. It is the sweet spot for shops producing 2,000-5,000 m² of duct per month.
Key Features
- Coil car with 2 stations for continuous coil feeding
- Leveling and grooving integrated in the main body
- Hydraulic notching and shearing
- Mitsubishi PLC control with frequency-controlled decoiler motors
- Sized for 2,000-5,000 m² of duct per month
- Upgradeable to Line 4 or 5
Production Outgrown Line 2 but a Full Line 5 Is Out of Reach?
Line 2 output caps out, but a Line 5 costs nearly twice as much and needs floor space you do not have. The gap in between is where most growing duct shops live.
The AML-3 adds the two-station coil car, integrated leveling and grooving, and hydraulic notching and shearing — enough capacity for 2,000-5,000 m² per month, with an upgrade path to Line 4 or 5 when you are ready.
How It Transforms Your Production Line
The Auto Duct Line 3 AML-3 works on a proven principle — here is the step-by-step workflow that makes it possible:
Coil Car Loading
The two-station coil car holds the running coil and queues the next one for continuous feeding.
Leveling & Grooving
The main body levels the strip and forms the stiffening grooves as it feeds.
Notching & Shearing
Hydraulic notching (sharp and TDF) and shearing to length run in-line at 12 m/min.
Blanks Out
Finished blanks discharge for lockforming and flange forming; folding and seam closing follow on your existing machines.
Technical Specifications & Performance Data
Every specification on this machine is chosen for a reason. The table below shows not just the numbers, but what each one means for your daily production:
| Parameter | This Machine | What It Means for You |
|---|---|---|
| Control System | PLC with touchscreen (Mitsubishi) | Consistent, repeatable operation with minimal operator training |
| Construction | Heavy-duty steel frame | Vibration-free operation, 10+ year service life |
| Certification | CE certified | Meets European safety and quality standards |
| Warranty | 2 years | Peace of mind with comprehensive factory warranty |
Problems Solved: Before vs. After
We asked HVAC fabricators about their biggest production headaches. Here is how this machine directly addresses each one:
| Without This Machine | With This Machine |
|---|---|
|
✕ Line 2 output ceiling
Blank prep cannot keep the lockformers fed |
✓ Two-station coil car
Continuous coil feeding, higher blank throughput |
|
✕ Manual coil changes
Stopping to change coils breaks the run |
✓ Queued second coil
Coil changes without stopping the line |
|
✕ Separate leveling station
A dedicated leveler costs floor space and setup |
✓ Integrated leveling & grooving
Leveling and grooving in the main body |
|
✕ Premature line 5 purchase
A full line 5 is more line than a growing shop needs |
✓ Right-sized capacity
2,000-5,000 m²/month with an upgrade path |
Where It Fits in Your Factory
This machine is versatile enough to serve multiple production scenarios. Here are the most common configurations our customers use:
Mid-Volume Shops
Sized for 2,000-5,000 m² of duct per month — the range most growing fabricators operate in.
Continuous Production
Two-station coil car keeps the line fed through coil changes.
Existing Lockformer Lines
Feed blanks into your existing lockformers and flange formers without replacing them.
Upgrade Path
Chassis accepts Line 4 and Line 5 stations when volume justifies them.
Frequently Asked Questions
Click each question to see the answer. These are the questions our sales engineers hear most often:
Professional Packaging & Global Shipping
Every machine is professionally packaged and secured in a container for safe delivery to your port. We send you loading photos before the ship sails.
Calculate Your Return on Investment
Based on average industry data, here is what a typical customer saves after installing this machine:
* Figures based on average customer data for a shop producing 100-500 bends per day. Your actual results will vary based on production volume, labor rates, and current efficiency levels. Contact our engineers for a customized ROI calculation based on your specific operation.
Ready to Upgrade Your Electric Production?
Get a customized quote within 24 hours. Our engineers will help you configure the right machine for your specific production requirements.
WhatsApp / WeChat: +86-18355321923 | Email: jason@predamachine.com
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Buying Guides for This Machine Type
Before you request a quote: how this machine class compares, what it costs, and how to size it for your production volume.
Auto Duct Line 3 vs 5
The two most popular PREDA lines compared on throughput, footprint and price — which pays back faster for your volume.
Read the guide → Buying GuideAuto Duct Line Buying Guide 2026
Line 1 to Line 5 compared — what each station adds and how to size a line to your output.
Read the guide → SetupHVAC Duct Factory Setup Guide
Laying out a duct shop around a coil-fed line: flow, clearances and staffing.
Read the guide →