Sheet Metal Duct Fabrication Factory

KDM is a professional sheet metal duct fabrication manufacturer. We also offer custom sheet metal fabrication services and bulk duct fabrication.

  • Simple to install
  • Aesthetically pleasing appearance
  • Available in oval, rectangular, and round duct
  • Meet high standards of the sheet metal

KDM - Sheet Metal Duct Fabrication

Sheet metal duct fabrication utilizes cutting and shaping procedures. Cutting involves the use of shears and high-definition plasma technology. In contrast, shaping involves brakes and presses to apply force to the material.

KDM offers complete sheet metal duct fabrication services for institutional HVAC, commercial and industrial projects. We can make different metal ducts, including oval ducts, rectangular ducts, spiral ducts, and fittings. It is perfect for various applications in a variety of industries, including manufacturing, mining, construction, and agriculture.

KDM sheet metal duct comes in many materials, aluminum, galvanized, stainless steel (304/316), PVS, and black iron. Furthermore, there are a variety of additional accessories to pick from.

Get in touch with us today to learn more about our sheet metal duct fabrication services.

KDM Sheet Metal Duct Fabrication Series

Sheet Metal Duct Enclosure Parts

The sheet metal duct enclosure parts are available with various metal alloys, including aluminum, stainless steel, and carbon steel. They have plated, powder-coated, and painted finishes. Multiple dimensions are customizable according to requirements.

Platinum Sheet Metal Duct

Platinum sheet metal ducts have powder-coated surface finishes. They are formed using galvanized steel, aluminum, or customized. That makes them resist corrosion and maximize strengths. Also, they have customizable shapes and sizes to suit project needs.

Copper Sheet Duct Stamping Parts
Copper Sheet Duct Stamping Parts

The copper sheet duct stamping parts come with polished, anodized, sandblasted, or painted surface treatments. They are easy to drill, bend, bend, stretch, and weld to achieve specific dimensions and shapes. Various used materials are available.

Electromagnetic Duct Sheet Metal Parts
Electromagnetic Duct Sheet Metal Parts

Electromagnetic duct sheet metal parts are designed using stamping, deep drawn, or punching processes. They usually have galvanized or pickling passivation surfaces. They are easy to form according to application specifications.

Galvanized Duct Sheet Welding Metal
Galvanized Duct Sheet Welding Metal

The galvanized duct sheet welding metals are suitable for household items, electronics, auto machinery, and medical equipment applications. They are accessible with different metal materials, including brass, steel, aluminum, and stainless steel.

Lasered Cut Duct Sheet Metal
Laser Cut Duct Sheet Metal

The laser-cut duct sheet metals are ideal for automobiles, electronics, and other machinery utilization. Their thicknesses, metal alloys, shapes, and sizes are customized depending on applications. They have polished edges with various texture surfaces to enhance safety and rigidity.

Heavy-Duty Sheet Metal Duct Parts
Heavy-Duty Sheet Metal Duct Parts

Heavy-duty sheet metal duct parts are in-demand for medical, agricultural, industrial, and automobile equipment applications. Well-processed components are designed to suit project necessities. They are with anodized or plated finishes.

Stainless Steel Stove Pipe Duct Collar
Stainless Steel Stove Pipe Duct Collar

The stainless steel stove pipe duct collars have about 0.2mm to 12mm or customized thicknesses. Different forms of various sizes are available. They have electro-galvanized, powder-coated, zinc, or hot dip galvanized finishes to add durability.

Aluminum Sheet Duct Auto Body Parts
Aluminum Sheet Duct Auto Body Parts

Aluminum sheet ducts for auto body parts have high precision standards. They come with multiple auto body components, forms, and dimensions. Their coated surfaces make them prevent rust and corrosion with high-impact strength.

9 Products Found.

KDM Sheet Metal Duct Fabrication Advantages

High Accuracy
High Accuracy

KDM can customize duct measurements according to suitable applications. Making them accurate to the units will improve the energy efficiencies. Also, having precise dimensions will not waste the produced heat.

Improved Durability
Improved Durability

Fabricating sheet metal ducts indeed improves their durability. Adding them with the suggested surface finishes will resist corrosion and rust, which results in an extended life span and rigidity.

Fast Installation
Fast Installation

KDM provides a guide for the proper installation of sheet metal ducts. The accurate sizes will make possible fast operations. They are lightweight, making them convenient to handle during installation.


Customizing sheet metal ducts are easy to process. They come in flexible, rectangular, cylindrical, or customized shapes. The correct choice of shapes guarantees good insulation and appropriate airflows. 

Unique Design

KDM own manufacturing tools and abilities to make custom design duct. Whether you need metal ducts for your unique building layouts or any other special project, we can create an optimum solution. Computer-aided design (CAD) software is used to design any form of the duct.

In regards to BTU per hour, the optimum duct system considers how much heating and cooling is required in each area. After that, you’ll need to figure out what materials to use, how big the system should be, and which tools to use. But no worries, we are here to help you determine the best solution for your needs.

Unique Design
Choosing the Right Material

Choosing the Right Material

Because of their excellent properties, metal ducts work exceptionally well in operations. This capability is made feasible by using high-quality raw materials. Let’s look at these metals in more detail.

  • Galvanized Mild Steel – is one of the most popular duct designs for structures. It is simple to personalize, thus providing enough protection against air loss.
  • Aluminum – is popular duct-work material due to its lightweight and corrosion resistance. Possesses ease of installation and the ability to bend to meet any shape.
  • Stainless Steel – is another cost-effective sheet metal option. It also resists corrosion and moisture. Provide a facility with a more appealing appearance.

Advanced Fabrication Capabilities

There are three stages of sheet metal duct fabrication.

  1. Cutting. It is the removal of unwanted metal through shear deformation. Different tools are used such as chisels, manual or power saws, shears, and CNC machining.
  2. Forming. It is a metal deformation process. Tools used are dies and punches. Machinery can also be used to control force direction and magnitude.
  3. Assembling. Entails connecting the cut and shaped components. It is assembled using both physical labor and machinery.

Following assembly, any specified finishing operations can be carried out, resulting in a finished fabrication.

Advanced Fabrication Capabilities

Choose KDM to Custom Sheet Metal Duct Fabrication

Sheet Metal Duct Fabrication
Sheet Metal Duct Fabrication

KDM tends to offer world-class sheet metal duct fabrication services. Our innovative manufacturing equipment can produce large quantities of fabricated duct components. We have great production machines that improve the sheet metal ducts quality. In contracts, maximizing the production rate significantly.

With more than ten years of knowledge and expertise, KDM brings high-quality duct fabrication services. From start to finish, in every stage of production, we strictly checked each unit. We create efficient and precise fabricated sheet metal ducts for your next project.

Regardless of your industry or project size, we can deliver a satisfying solution for you. If you have questions about custom metal duct fabrication, please feel free to contact us today.

KDM Sheet Metal Duct Fabrication

Benefits & Advantages 
Benefits & Advantages 
  • Greater energy efficiency
  • Increase performance
  • Reduced energy bills
  • Efficient ventilation
  • Built to last
  • Cost-saving
  • Fast Installation
Industries Served
  • Transportation
  • Electronics
  • Oil and Gas
  • Hospitals
  • Packaging
  • Heating & Cooling
  • Defense Industries
  • Manufacturing & Distribution

Sheet Metal Duct Fabrication Industrial Applications


KDM delivers quality collections of metal duct fabrication. The finished products are made to give airflow performance, providing superior outcomes. These are made of high-quality materials and come in a variety of sizes and specifications.


Sheet metal duct features high performance, low energy consumption, and low maintenance. The most common material grades utilized are 304 stainless steel, 316 stainless steel, COR-TEN steel, etc. End-products are built to last.

Food & Beverage Plants
Food & Beverage Plants

KDM is very careful in metal duct fabrication for food processing plants. However, we ensure these ducts meet the health and safety codes. It delivers clean air into the structure and evacuates stale air. Customization is also offered.

Manufacturing Hub
Manufacturing Hub

With years of expertise, KDM from a variety of manufacturing plant ducting projects. From small system fabrications to large, sophisticated systems. We’d exceed industrial standards on all metal duct fabrication works.

Healthcare Facilities
Healthcare Facilities

Duct fabrication for medical facilities is designed to eradicate increased concentrations of germs. In contrast, it also maintains a suitable climate for medical research. They keep precise interior temperatures and humidity levels in the room.

Sheet Metal Duct Fabrication Factory
Sheet Metal Duct Fabrication Factory in China

More than 10 years in sheet metal duct fabrication. Handle small to large fabrication projects. Can custom any shape or size.

  • “KDM has exceeded our expectations in every way, from planning and bidding to project completion, and has helped us fill in the gaps when our fabrication shop is overburdened, allowing us to continue to manufacture for our larger customers.”

  • “KDM is trustworthy and a pleasure to work with every time. Our detailing department can transmit entire fabrication files for quote and release, guaranteeing that all parts are produced to our requirements. Their lead times, quality, and deliveries are second to none.”

  • “KDM is the best in the industry! They will meet the customer’s schedule, deliver a quality product on time and at a reasonable price, and they simply do it all, from the simplest custom to the most complex custom, Architectural, or Industrial project.”

Sheet Metal Duct Fabrication: The Ultimate FAQ Guide

I know probably, you want to learn more about sheet metal duct fabrication.

A reason this guide will take you through all the vital aspects of sheet metal duct fabrication.

Take a look:

What Is A Sheet Metal Duct?

A sheet metal duct is a component of your HVAC operating unit as they control the quality of air indoors.

The sheet metal duct will assist with the circulation and exchange of fresh and temperature-controlled air.

A Sheet Metal Duct

A Sheet Metal Duct

What Are The Benefits Of Sheet Metal Duct Fabrication?

Sheet metal duct fabrication is popular for a reason.

One of the reasons is that is it cost-effective at attaining the desired size and shape while requiring a short duration to perform.

Sheet metal duct fabrication also offers strong and durable components that meet the required standards.

Here are some benefits of sheet metal duct fabrication:


One main reason why sheet metal duct fabrication benefits businesses is because of the malleability you can achieve from them.

Besides being durable, you can fabricate the sheet metal ducts into any shape.

This allows you to make sheet metal ducts that can fit in any environment.


Metal sheets can withstand high-pressure amounts thus making them durable.

Furthermore, sheet metal duct fabrication allows you to make products that have the following qualities:

  1. Water-resistant
  2. Moisture resistant
  3. Sun resistant
  4. Corrosion-resistant

Metal Ducts Can Withstand High Temperatures Thus Very Durable

Metal Sheets Can Withstand High Pressure Hence Very Durable

This means metal sheet duct fabrication allows you to make products that can operate in a wide range of environments.


Sheet metal duct fabrication materials are extremely lightweight, unlike other materials which are durable yet heavy.

This allows you to make sheet metal ducts that are extremely portable.

Furthermore, this will allow the sheet metal duct fabricators to manage and handle such materials easily.

Simple Modification

Sheet metal duct fabrication allows you to modify and adjust the components.

This allows you to easily expand it on various structures which might be impossible when using other materials.


Sheet metal duct fabrication allows you to make seamless finishes.

Furthermore, you can modify and paint the sheet metal duct thus making it lucrative for different applications.

What Are Stages In Sheet Metal Duct Fabrication?

Some of the key steps in sheet metal duct fabrication include:

Blank Cutting Of Sheet Metal Duct

Blank Cutting Of A Sheet Metal Duct

Step 1: Outline Specifications For Sheet Metal Duct

Some of the specifications include the following:

  • Easy to install
  • Energy-saving due to minimized leakage
  • Useful for HVAC duct systems
  • High quality and durable material construction
  • 12-month warranty
  • Lightweight material construction
  • Galvanized mild steel, aluminum, or stainless steel material construction
  • Resistant to moisture and corrosion

Also, at this stage, you will specify all dimensions and measurements depending on your requirements.

You will have a technical drawing with all critical measurements.

Metal Bending

Metal Bending

Step 2: Choose Suitable Material For Sheet Metal Duct Fabrication

There are several kinds of materials you can use when conducting a sheet metal duct fabrication.

These include the following:

Galvanized Mild Steel

This kind of material is used with a zinc coating that is rust-resistant and is common for making custom ducts and ductwork fabrication.

Furthermore, you can easily cut, form, and fabricate it into several shapes for use in different areas.

It has the benefit of offering ample protection from the loss of air thus assisting you to minimize the energy bills.

Also, the smooth finish of the galvanized steel sheet metal duct fabrication will form suitable airflow compared to other metal duct fabrication.

It will also protect the sheet metal duct against the growth of mold and fungus.

Stainless Steel

Stainless Steel

This is another type of metal you can use to conduct sheet metal duct fabrication.

Besides, it is popular with ductwork fabrications and in creating custom ducts.

Furthermore, stainless steel offers more strength than galvanized steel or even aluminum sheet metal ducts.

Stainless steel will also increase corrosion resistance from external elements such as airborne chemicals or moisture.

Some industries that select stainless steel as their top choice when it comes to making sheet metal ducts include the following:

  1. Laboratory environments
  2. Commercial facilities
  3. Industrial facilities
  4. Food processing plants
  5. Institutional facilities, etc.

Furthermore, stainless steel sheet metal duct fabrication needs precise devices and experienced craftsmen to perform the following tasks:

  1. Cutting
  2. Forming
  3. Fabricating
  4. Welding
  5. Installing

This ensures that the parts you fabricate will attain a high-quality HVAC unit that has a high-performance level.


This material is resistant to corrosion and is lightweight.

These benefits make aluminum a popular option when conducting sheet metal duct fabrication.

Aluminum material is suitable for use both indoors and outdoors within the following areas:

  1. Automotive industries
  2. Mining industries
  3. Construction industries
  4. Printing industries

Besides, aluminum material is easy to install and you can easily fit and bend it into any shape.

Furthermore, you should tightly fit all parts of the sheet metal duct, ensuring they offer stability and sturdiness which inhibits air leakages.

Stainless Steel Metal Duct System

Stainless Steel Metal Duct System

Step 3: Cutting Technique During Sheet Metal Duct Fabrication

At this point, you will cut sheet metal to appropriate size and dimensions.

This will depend on the shape of sheet metal duct you need.

Depending on your capability, you can use any of the following:

Laser Cutting

Laser Cutting

This entails burning through the sheet metal to form accurate cuts.

Also, no contamination will occur as there is no physical contact with the sheet metal.

No warping occurs during laser cutting and leaves a clean and consistent cut.

Laser cutting is fast and eco-friendly as it uses less energy than other cutting methods.

Plasma Cutting

This method will use hot plasma to cut sheet metals.

The plasma operates at a high speed in a specific jet stream to make accurate cuts.

It is affordable to conduct thus making it a popular choice.

Also, it is quick but not as quick as laser cutting.

Plasma Cutting of Sheet Metal duct

Plasma Cutting of Sheet Metal

Waterjet Cutting

This method entails using high-powered water jets to cut through sheet metal.

Therefore, it will not leave heat zones on the sheet metal.

Waterjet cutting is precise and leaves a clean finish on the sheet metal.

The two methods you can use are abrasive jet and water-only or pure waterjet cutting.


This is a less accurate method of cutting thus not suitable for detailed small cuts

It is suitable for cutting large sheet metals from large rolls to small manageable sizes.

Also, you will use blades to make the cuts that are parallel to the other cut edge.

Also, you cannot make angled cuts.


This is a technique of cutting out metal pieces from sheet metal.

Here, you will apply force to remove the area from the sheet metal thus leaving out a hole.

Also, you will punch out geometric shapes and the size you can punch out is not limited.

However, it will not leave behind clean edges which you need to smooth out later on.


In this process, the pieces you punch out are used in other processes whereas the other part of the sheet metal is scrap.

Step 4: Forming Techniques In Sheet Metal Duct Fabrication

Here, you will bend the sheet metal to form appropriate duct.

It is important to understand the various forming techniques that you will use in sheet metal duct fabrication.

Besides, these forming techniques assist in transforming flat metal sheets into a three-dimensional metal duct with functional parts.

Here are some main forming techniques in sheet metal duct fabrication:



This is a cold-forming technique that will transform flat sheet metal into different shapes for the duct fabrication process.

In the stamping process, you will use a tool and a die.

It entails impacting the tool and die on sheet metal to change the form of the metal when you use shear pressure.

Stamping is a broader terminology when you are referring to sheet metal duct fabrication.

It will include bending, embossing, as well as punching.

Furthermore, it includes flanging, which involves swiping the sheet metal until it forms flanges.


This is another important step in sheet metal duct fabrication that changes its shape and not its volume.

As the name states, it entails bending the sheet metal into the required shape for the fabrication process.

Some pieces of equipment that metal fabricators will use when bending include rolling machines, press brakes, etc.

For instance, press brakes will force the sheet metal between the vee-shaped lower tool and the knife-edge upper tool.

This will form the sheet metal to the appropriate angle to lengths of up to 10 m long.

This equipment will form standard shapes like U shape, channel shape, or V shape when conducting sheet metal duct fabrication.

Bending may seem like a simple process to an untrained eye but it is rather a complex technique requiring an expert fabricator.

This is mainly due to the possibility of spring back occurring.

Spring back is a terminology that describes a metal that tries to retain its original flat-shaped structure following the bending process.

Sheet metal duct fabricators combat this issue by over bending the component.

Bending Of Sheet Metal Duct

Bending Of Sheet Metal Duct

This allows the spring-back angle to take the appropriate angle for the sheet metal duct.

Bending is the most cost-effective sheet metal duct fabrication process besides being highly versatile.


This is a technique you will use when you want to form holes during sheet metal duct fabrication.

Punching works with a punch and a die which is made of hard metals.

The materials will apply shear force for it to make holes into the sheet metals.

Afterward, the die will gather the scrap metal that you have created from punching the hole on the sheet metal.

The punching process can assist you to form indentations within the sheet metal.

There are punching machines that can make holes that have a diameter of about 50 mm.

Punching In Sheet Metal Duct Fabrication

Punching In Metal Duct Fabrication


This is a process you will use when you desire to form smooth curves during sheet metal duct fabrication.

For instance, you should use a roll forming method when fabricating shapes like cylinders, rounded architectural structures, or cones.

During the rolling process, you will pass the sheet metal duct via several roll systems until you attain the desired curve and width.

Rolling Sheet metal Duct

Rolling Sheet Metal Duct

  • Embossing

In this sheet metal duct fabrication process, you will raise or sink the sheet metal design by passing it through rolls with patterns.

Some fabricators can also polish and weld the edges of the sheet metal duct to form a high-quality surface finish.

An Embossing Machine

An Embossing Machine

Step 5: Assembly Processes In Sheet Metal Duct Fabrication

Assembling is the process of joining pieces that you have cut and formed.

Also, you can perform the assembly process either manually or automatically.

Besides, you can conduct sheet metal duct fabrication assembly through the following methods:


This is the process of joining separate components together.

Examples of welding techniques you can use during sheet metal duct fabrication include:

  1. Spot welding
  2. CO2 welding

Examples of welding methods you can use in sheet metal duct fabrication include:

  1. TIG

This stands for Tungsten Inert Gas.

It is a suitable welding method where you can join the majority of metals to high standards.

  1. MIG

This stands for Metal Inert Gas.

Besides, it is suitable for welding mild steel and is a cost-effective method for heavy structures.

  1. Stick welding.

TIG Welding in progress

TIG Welding In Progress


Use threaded fasteners, rivets, or adhesives.

This technique will join two or more parts by binding them together.

For instance, you may drill holes between the two parts and secure them with fasteners or rivets.

This is a popular way of assembling sheet metal ducts as they are simple to accomplish and are affordable.

Also, you can seal the seams of the sheet metal duct at its connections with substances such as:

  1. Metal tape
  2. Rubbery duct sealant
  3. Mastic.

However, you should steer away from using standard duct tape since the adhesive will dry out after a while thus breaking the seal.

Sheet Metal Bending

Sheet Metal Bending

Clinching And Bonding

One way you can join sheet metal ducts without using rivets, bolts, or screws is through clinching.

This is a way you can use to save costs.

Besides, it will not produce heat, fumes, or sparks and you can use it to join dissimilar parts.

Other techniques may include riveting and bonding.

The choice of bonding or assembly technique will depend on the type metal duct.

Step 6: Check And Test Quality After Sheet Metal Duct Fabrication

This entails ensuring the sheet metal duct conforms to quality standards and meets the design specifications.

Some methods you can use to test the quality of sheet metal include:

  • Tensile strength
  • Fatigue test
  • Hardness test
  • Hole expansion test
How Much Will Sheet Metal Duct Fabrication Cost?

The cost of metal sheet duct fabrication depends on a lot of factors such as:

  • Size
  • Material construction
  • Assembly method
  • Cutting method

Of course, other factors such as custom features and finishing requirements may also determine cost of sheet metal duct fabrication.

At KDM, we help you get high quality and reliable sheet duct fabrication.

Contact us now for all your sheet metal duct fabrication needs.

Send Your Inquiry Today
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