When I talk to customers about a Medium-Pressure Double-Inlet Air Supply Fan, I usually start with the actual working condition rather than the fan model. In real projects, airflow is only part of the story. The fan also needs to deal with duct resistance, filters, dampers, air temperature, installation space, motor requirements, and sometimes long hours of continuous operation.

That is why we do not simply recommend a fan because its motor looks powerful enough. We first look at what the ventilation system needs and then select a fan configuration that can work with those conditions.

Our Medium-Pressure Double-Inlet Air Supply Fan is designed for air supply applications where stable airflow and moderate system pressure are required. The double-inlet structure allows air to enter the impeller from both sides, making this type of fan suitable for a range of HVAC and industrial ventilation projects.

At Zhejiang Shangyang Industrial Fan Co., Ltd., we have around 20 years of experience in fan technology design, manufacturing, and sales. Our sales company is located in Shanghai, while our manufacturing facility is located at No. 6-8, Bifa Road, Xinbi Subdistrict, Jinyun County, Lishui City, Zhejiang Province.

We manufacture standard and non-standard industrial fans, including Centrifugal Fans, High-Temperature Fans, induced draft fans, axial fans, Low-Noise Centrifugal Fans, High-Pressure Fans, stainless steel centrifugal fans, hot air circulating fans, mixing fans, and explosion-proof centrifugal fans.

Over the years, our products have been used in coating, kiln, boiler, environmental protection and dust collection, thermal energy, printing, coating equipment, medical latex equipment, air-supported membrane, separation, cement, chemical, and food industries. That range of applications has taught us one important lesson: the right fan is the one that matches the complete system, not just one attractive number on a specification sheet.

1. What Is a Medium-Pressure Double-Inlet Air Supply Fan?

A Medium-Pressure Double-Inlet Air Supply Fan is an industrial fan designed to move air through ventilation, air conditioning, and air supply systems where the fan needs to overcome a moderate level of system resistance.

The term “double-inlet” describes the way air enters the fan. Instead of taking air into the impeller from only one side, the fan allows air to enter from two sides.

The term “medium-pressure” describes the type of duty the fan is intended to handle. It does not mean that every fan with this product name has one fixed pressure value. The actual pressure depends on the selected fan size, impeller, speed, motor, system resistance, and operating point.

This is an important point when comparing industrial fans. I often see buyers searching online for a fan based only on the words “medium pressure.” That is not enough information for proper selection.

For example, two fans may both be described as Medium-Pressure Fans, but they can have very different airflow, pressure, speed, motor power, and dimensions. One may be suitable for a factory ventilation system while another may be intended for a completely different installation.

We therefore confirm the actual operating requirements before production.

Why Use a Double-Inlet Structure?

The basic idea is simple. Air enters from both sides of the impeller, passes through the rotating blades, and is directed toward the fan outlet.

For suitable applications, this arrangement provides a practical way to handle larger air volumes while keeping the fan structure appropriate for the available installation space.

However, I would not say that a double-inlet fan is automatically better than a single-inlet fan. The correct choice depends on the complete system.

If the system has enough space for the two inlet sides and requires the performance range of a double-inlet arrangement, it can be a very practical option. If installation space is limited or the airflow requirement is relatively small, another fan structure may make more sense.

Why Does Medium Pressure Matter?

Air does not move through a ventilation system without resistance.

A long duct creates resistance. A filter creates resistance. Elbows, dampers, transitions, grilles, heat exchangers, and other equipment also create pressure losses.

The fan must provide enough pressure to overcome these losses while delivering the required air volume.

This is why we normally ask for both air volume and pressure before selecting the fan.

AMCA's fan testing and rating standards also treat airflow rate, pressure, power, air density, rotational speed, and efficiency as important fan performance information.

2. How Our Double-Inlet Air Supply Fan Works

The working principle is not complicated.

When the motor starts, it drives the fan's rotating assembly. As the impeller rotates, air is drawn into the fan through the two inlet openings. The rotating blades transfer energy to the air, and the casing guides the air toward the discharge side.

The air then enters the connected duct or ventilation equipment.

That is the basic process, but the real engineering work is making sure the fan operates at the right point.

Air Volume

Air volume tells us how much air the system needs to move.

Customers may provide this value in m³/h, m³/s, CFM, or another unit. We can convert the information when necessary, but the final technical specification should use a clear and agreed unit.

If the required airflow is too low for the selected fan, the fan may not operate efficiently. If the airflow requirement is too high, the fan may not have enough capacity.

Pressure

Pressure is the other half of the selection problem.

Imagine pushing air through a short duct with few fittings. Now compare that with a long duct containing several elbows, filters, dampers, and air treatment equipment.

The second system has much more resistance.

Our fan needs to provide enough pressure to overcome that resistance.

AMCA also points out that system effect can occur because of poor airflow conditions near a fan inlet or outlet. Changes in duct length, width, transitions, or nearby duct configuration can reduce actual fan performance after installation.

Motor Power

The motor is selected according to the fan duty.

We confirm motor power together with voltage, frequency, speed, and other electrical requirements. This is particularly important for international orders because electrical standards can differ between markets.

I always recommend confirming these details before production instead of trying to change the motor after the fan has been manufactured.

Rotation Speed

Fan speed affects airflow, pressure, noise, and power demand.

That means speed is not simply a number we change whenever we want more airflow.

AMCA technical guidance notes that increasing fan speed can have a significant effect on energy consumption and mechanical loading. Its published discussion gives the example that a 10% speed increase can result in roughly 33% higher energy consumption.

For that reason, I prefer to select the fan correctly from the beginning rather than use excessive speed to compensate for an unsuitable system.

Air Temperature

Normal HVAC air is usually not a difficult condition for a standard air supply fan.

Industrial process air can be different. If the fan handles hot air, humid air, corrosive gas, or another special medium, we need to know that before production.

Material selection, motor arrangement, bearings, sealing, and other details may need to change according to the working environment.

Source: Zhejiang Shangyang Industrial Fan Co., Ltd. product selection practice; AMCA fan performance guidance. Actual values must be confirmed according to the specific application.

3. Main Features I Focus on During Fan Selection

When I evaluate an industrial fan, I do not focus only on how the machine looks. A fan may look good in a product photo, but the real test is what happens after it is connected to a duct system and runs every day.

Stable Medium-Pressure Air Supply

The first goal is stable airflow.

Our Medium-Pressure Industrial Air Supply Fan is designed for systems where the fan needs to provide reliable air delivery against moderate resistance.

This makes it suitable for many HVAC and industrial ventilation applications.

Double-Sided Air Intake

The double-inlet structure allows air to enter the impeller from both sides.

This is useful when the required airflow and installation arrangement suit a double-inlet configuration.

It can be particularly practical for larger air supply systems where a single-inlet design may not be the preferred arrangement.

Flexible Configuration

We can configure the fan according to the customer's requirements, including airflow, pressure, motor power, rotation speed, temperature, material, and installation dimensions.

This is especially useful for industrial customers because many projects are not standard building HVAC installations.

Low-Vibration Design and Assembly

Vibration is something we take seriously.

Excessive vibration can come from several sources, including rotating imbalance, incorrect alignment, loose fasteners, bearing problems, poor installation, or unfavorable duct conditions.

Good fan manufacturing can reduce mechanical problems, but the installation still matters.

AMCA's field-performance guidance covers aerodynamic performance as well as issues related to noise, vibration, and mechanical operation, showing why fan performance should be considered as part of the complete installed system.

Practical Maintenance

Industrial equipment should not be difficult to maintain.

During regular maintenance, operators should check the motor, bearings, rotating components, fasteners, electrical connections, inlet and outlet passages, and other parts according to the actual equipment configuration.

For fans working in dusty, humid, hot, or corrosive environments, inspection intervals may need to be adjusted.

Standard and Non-Standard Manufacturing

Our factory produces both standard and non-standard industrial fans.

This gives us more flexibility when a customer needs special dimensions, materials, motor arrangements, air volume, pressure, or installation details.

4. Medium-Pressure Fan vs. Other Fan Types

Customers often ask us whether they should choose an axial fan, Mixed flow fan, or centrifugal fan.

There is no single answer.

Each fan type has its own working characteristics.

Axial fans move air mainly along the fan shaft. Mixed flow fans combine axial and radial airflow characteristics. Centrifugal fans turn the airflow outward from the impeller and are commonly used where pressure and duct resistance are important.

AMCA defines a mixed-flow fan as a fan where airflow through the impeller is between centrifugal and axial flow, with the air moving in both axial and radial directions.

Source: AMCA terminology and fan application publications, including AMCA 99 and AMCA 203. This is a general structural comparison, not a universal performance ranking.

Why We May Recommend a Double-Inlet Fan

If the customer has a large air volume requirement, a suitable installation layout, and a system that needs moderate pressure, a double-inlet Centrifugal Air Supply Fan can be a practical solution.

If the system mainly needs very large air volume at relatively low pressure and the installation is simple, an axial fan may be worth considering.

If the application sits between axial and centrifugal characteristics, a mixed flow fan may be appropriate.

The important thing is to select based on the actual system.

5. Where Can the Medium-Pressure Double-Inlet Air Supply Fan Be Used?

Our fans are used across many industrial and commercial applications.

HVAC and Air Conditioning

HVAC systems need reliable air movement through ducts and air handling equipment.

Our medium-pressure double-inlet air supply fan for HVAC systems can be configured according to the required airflow and pressure.

For large commercial or industrial HVAC systems, we pay particular attention to duct resistance and installation conditions.

Factories and Workshops

Factories often need ventilation for large spaces and long operating periods.

Our Industrial Air Supply Fans can be used as part of a workshop ventilation system when the fan performance matches the required duty.

Warehouses

Warehouses may need fresh air supply, temperature control, or general air circulation.

In these applications, the fan selection is usually based on building size, required air changes, duct arrangement, and the desired ventilation strategy.

Commercial Buildings

Hotels, shopping centers, office buildings, and other commercial facilities can require central air supply.

Here, stable airflow, noise, installation space, and maintenance access can all become important.

Industrial Equipment

Some production machines and industrial systems require dedicated air supply.

In this case, the fan may need to work as part of the machine rather than as a building ventilation system.

Printing and Coating Equipment

Our company has experience with fans used in printing and coating applications.

These systems may require different air supply and exhaust functions depending on the production process.

Environmental Protection Systems

Our broader product range includes environmental protection and dust collection fans.

Where a ventilation system needs to move process air through filters or treatment equipment, pressure losses become especially important.

Boiler and Thermal Systems

Boiler and thermal applications can involve different temperatures and air conditions.

For high-temperature applications, I would not automatically use a standard air supply fan. We first check the actual temperature and process conditions and determine whether a high-temperature fan is more appropriate.

AMCA's field measurement publication specifically covers fans used in heating, ventilation, air conditioning, industrial processes, exhaust, drying, air cleaning, and dust collection, showing how broad the industrial fan application range can be.

6. How We Manufacture a Medium-Pressure Double-Inlet Air Supply Fan

For me, manufacturing starts with technical communication.

If we do not understand the working condition, we cannot responsibly select the fan.

Step 1: Confirm the Application

We first ask where the fan will be used and what it needs to do.

Is it for HVAC? A factory? A production line? A warehouse? A special industrial machine?

The answer affects the selection.

Step 2: Confirm Airflow and Pressure

These are the two most important starting points.

If the customer already has a system calculation, we can use the specified airflow and pressure.

If not, we can review the available duct and equipment information.

Step 3: Check Temperature and Air Characteristics

Normal clean air and hot or corrosive process air should not be treated as the same thing.

We confirm the air temperature and other relevant conditions before deciding on materials and fan construction.

Step 4: Design the Fan Configuration

Once the operating condition is clear, the fan structure can be determined.

This includes the impeller, casing, inlet, outlet, motor, drive arrangement, and installation dimensions.

Step 5: Manufacture the Main Components

The casing and rotating components are manufactured according to the confirmed design.

The impeller deserves particular attention because it directly affects the fan's aerodynamic and mechanical performance.

Step 6: Assembly

The motor, impeller, casing, shaft, bearings, and other relevant components are assembled according to the selected configuration.

Step 7: Inspection

Before delivery, we check the agreed specifications and the physical assembly condition.

For customers requiring specialized products, our company has multiple national test reports and applicable certifications, including national explosion-proof certification and energy efficiency certification for relevant products.

It is important to understand that a certification applies to a specific product and configuration. If a project has a special certification requirement, we confirm the exact requirement before production.

7. Performance, Testing and Why System Design Matters

I want to spend a little time on this because it is one of the easiest things to overlook when buying a fan online.

A fan does not operate in isolation.

Its actual performance depends on how it is connected to the system.

AMCA Standard 210 establishes laboratory methods for determining fan aerodynamic performance in terms including airflow rate, pressure, power consumption, air density, rotational speed, and efficiency.

But a laboratory result is not the whole installation.

Once the fan is installed, the duct arrangement can change the actual airflow conditions.

AMCA explains that poor flow conditions at the inlet or outlet can create system effect and reduce performance. It also notes that poor system conditions can increase noise, vibration, and mechanical stress.

This is why we ask about the installation layout whenever possible.

Do Not Ignore the Duct

A fan may be correctly selected on paper but perform differently if the duct immediately before or after the fan is poorly arranged.

Sharp transitions, unnecessary bends, sudden changes in duct size, or unsuitable inlet conditions can disturb airflow.

For an industrial project, I recommend treating the fan and duct system as one package rather than two unrelated pieces of equipment.

Do Not Oversize the Fan Without a Reason

Some buyers think that choosing a larger fan is safer.

Sometimes it is. Sometimes it simply increases the cost.

An oversized fan may require additional control measures, consume more power, or operate away from the desired working point.

Our goal is to select a fan that fits the real duty.

Efficiency Matters During Long-Term Operation

A fan may run for thousands of hours over its service life.

That means even a small difference in operating efficiency can become meaningful over time.

The U.S. Department of Energy provides fan-system assessment resources and specifically highlights energy-management practices and energy-efficient equipment as ways to reduce fan-system energy and operating costs.

For this reason, I prefer to discuss the complete operating condition with customers rather than focus only on the purchase price.

8. Production Cycle, Delivery, Payment, Shipping and Packaging

Buying industrial equipment involves more than selecting the right fan.

Customers also need a clear idea of production time, delivery contents, payment, transportation, and packaging.

Production Cycle: About 7–20 Working Days

Our typical production cycle is approximately 7–20 working days.

This is a general reference, not a fixed delivery promise for every order.

The actual time depends on the fan model, airflow and pressure requirements, motor, material, customization, order quantity, and production schedule.

Delivery Standard

Standard delivery normally includes the complete fan unit, motor, and agreed accessories according to the final technical specification.

If a project requires special accessories, dimensions, flanges, connectors, control components, or other parts, these should be confirmed before production.

Payment

Payment terms can be arranged according to the order agreement.

A common arrangement is a deposit before production and the balance before shipment.

For customized industrial equipment, we recommend confirming technical specifications, quantities, delivery conditions, and commercial terms before production begins.

Transportation

For domestic deliveries, road freight is commonly used.

For overseas customers, sea freight is often practical for industrial fan equipment. Other logistics options can be discussed depending on destination, delivery schedule, product size, and customer requirements.

Packaging

Our packaging method depends on the size and structure of the fan and the transportation conditions.

Common options include protective film, reinforced cartons, wooden frames, and wooden cases.

For long-distance and international transportation, reinforced wooden protection can help reduce damage caused by impact, moisture, stacking, and handling.

Source: Zhejiang Shangyang Industrial Fan Co., Ltd. product and order information supplied for this page. Actual lead time, delivery contents, payment terms, packaging and logistics are confirmed in the final quotation and purchase agreement.

9. Why Choose Us for a Medium-Pressure Double-Inlet Air Supply Fan?

I know that “experienced manufacturer” is a phrase used by many companies, so I would rather explain what our experience means in practical terms.

About 20 Years of Industry Experience

Our technical design, manufacturing, and sales teams have around 20 years of experience in industrial fans.

That experience is useful because fan selection often involves more than choosing a standard model from a list.

Customers may come to us with incomplete specifications, an existing machine, a replacement fan, a limited installation area, or a non-standard airflow requirement.

We can start with the information available and work toward a workable specification.

Standard and Non-Standard Production

Our factory manufactures different kinds of industrial fans, including standard and customized products.

We have experience with centrifugal fans, high-temperature fans, induced draft fans, axial fans, low-noise centrifugal fans, high-pressure fans, stainless steel centrifugal fans, hot air circulating fans, mixing fans, and explosion-proof centrifugal fans.

Experience Across Multiple Industries

Our products have been used in coating, kiln, boiler, environmental protection, dust collection, thermal energy, printing, medical latex equipment, air-supported membrane, separation, cement, chemical, and food industries.

This matters because each industry presents different operating conditions.

Product Development

Our coating fan and environmental protection fan development work was based on technical experience from Taiwan, followed by more than a decade of continuous improvement and optimization.

We have always treated technological improvement as an important part of the company's development.

Testing and Certifications

Our company possesses multiple national test reports for specialized products and has obtained applicable certifications including national explosion-proof certification and energy efficiency certification for relevant products.

When a customer needs a certified product, we confirm the exact certification requirement and product configuration before production.

Practical Technical Communication

Perhaps the most important part is communication.

If a customer tells us only the motor power, we will not treat that as a complete fan specification.

We want to understand the airflow, pressure, temperature, installation dimensions, air characteristics, operating hours, and connected system.

That approach takes a little more effort at the beginning, but it helps us avoid many problems later.

10. How to Choose the Right Medium-Pressure Double-Inlet Air Supply Fan

If you are sourcing a medium-pressure double-inlet industrial fan, I recommend preparing a few basic pieces of information.

• Required air volume

• Required static pressure

• Air temperature

• Air characteristics

• Installation location

• Inlet and outlet dimensions

• Motor voltage

• Power frequency

• Motor power, if already specified

• Expected operating hours

• Required quantity

• Special material requirements

• Certification requirements, if applicable

If you have an existing fan, sending us its nameplate information can also help.

If you have a technical drawing, duct drawing, equipment specification, or system calculation, that is even better.

And if you do not have all the information, do not worry. We can start with what you know and determine what additional information is needed.

11. Frequently Asked Questions

Q1: What is a Medium-Pressure Double-Inlet Air Supply Fan?

It is an industrial air supply fan designed for applications requiring stable airflow and moderate pressure. Its double-inlet structure allows air to enter the impeller from two sides.

Q2: What is the benefit of a double-inlet fan?

The double-inlet structure allows air to enter from both sides of the impeller and is suitable for applications where the required airflow and installation arrangement match this design.

Q3: Is it suitable for HVAC systems?

Yes. It can be configured for suitable HVAC and air conditioning applications according to airflow, pressure, motor power, temperature, and installation requirements.

Q4: Can you customize the fan?

Yes. We manufacture standard and non-standard industrial fans. Airflow, pressure, motor power, rotation speed, material, dimensions, and other requirements can be discussed.

Q5: What industries use this type of fan?

Typical applications include HVAC, factories, workshops, warehouses, commercial buildings, industrial production lines, printing equipment, coating equipment, environmental protection systems, and other ventilation projects.

Q6: How do I know whether I need a double-inlet or single-inlet fan?

The decision depends on airflow, pressure, installation space, system layout, and the fan's required operating point. We recommend selecting the structure after reviewing the complete application.

Q7: What information do you need for fan selection?

The most useful information is airflow, pressure, temperature, air characteristics, installation dimensions, motor requirements, and quantity. A drawing or existing fan specification is also helpful.

Q8: Can the fan be used for continuous operation?

It can be configured for continuous industrial operation when the selected fan, motor, bearings, and working conditions are suitable. Continuous-duty requirements should be confirmed before production.

Q9: Can you provide stainless steel construction?

Yes. We manufacture stainless steel centrifugal fans. If the application has corrosion or material compatibility concerns, we can discuss suitable construction options.

Q10: What is the normal production time?

The typical production cycle is approximately 7–20 working days. Actual lead time depends on the model, specifications, customization, materials, and order quantity.

Q11: What payment terms are available?

Payment terms can be arranged according to the order agreement. A common arrangement is a deposit before production and the balance before shipment.

Q12: How do you package the fan?

Depending on the product size and transportation conditions, we normally use protective film, reinforced cartons, wooden frames, or wooden cases.

Q13: Can you export the fan?

Yes. Our products are sold throughout China and exported overseas as supporting equipment. Sea freight and other suitable logistics solutions can be arranged according to the destination.

Q14: Do you manufacture other industrial fans?

Yes. Our product range includes centrifugal fans, high-temperature fans, induced draft fans, axial fans, low-noise centrifugal fans, high-pressure fans, stainless steel centrifugal fans, hot air circulating fans, mixing fans, and explosion-proof centrifugal fans.

12. Our Final Advice Before You Place an Order

After working with industrial fans for many years, I have found that most fan problems do not start with the fan itself. They often start with incomplete information.

A customer may know the airflow but not the pressure. Another customer may know the motor power but not the actual system resistance. Someone else may have the old fan dimensions but not know why the old fan was selected.

That is why I recommend looking at the entire ventilation system.

For a Medium-Pressure Double-Inlet Air Supply Fan, start with the required airflow and pressure. Then check temperature, air characteristics, motor specification, installation space, duct arrangement, operating hours, and maintenance conditions.

Do not select a fan simply because its motor is larger.

Do not select a fan simply because its airflow number looks impressive.

And do not assume that the fan's catalog performance will automatically be the same after installation. Duct arrangement and system effect can influence real-world performance. AMCA specifically recommends considering system-associated losses when selecting and installing fans.

Our job is to help turn those requirements into a practical fan specification.

13. Conclusion

Our Medium-Pressure Double-Inlet Air Supply Fan is designed for customers who need stable and dependable air delivery in HVAC, air conditioning, factory ventilation, workshop ventilation, and industrial air supply systems.

The double-inlet structure allows air to enter the impeller from both sides, while the fan can be configured according to airflow, pressure, motor power, rotation speed, temperature, materials, and installation requirements.

At Zhejiang Shangyang Industrial Fan Co., Ltd., we combine around 20 years of fan design, manufacturing, and sales experience with standard and non-standard production capabilities.

Our products are used in many industries, from HVAC and factory ventilation to coating, printing, thermal energy, environmental protection, chemical, cement, and food applications.

We believe good fan selection starts with understanding the working condition. Once the requirements are clear, we can select the fan structure, determine the main specifications, confirm the motor and installation dimensions, manufacture the equipment, inspect the agreed configuration, and arrange suitable packaging and delivery.

If you are looking for a Medium-Pressure Double-Inlet Air Supply Fan, you can send us the required airflow, pressure, temperature, motor information, installation dimensions, or an existing fan drawing. Even if some information is missing, we can start with the details you already have and work from there.

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Technical and company information: Zhejiang Shangyang Industrial Fan Co., Ltd. product and company information supplied for this page. General fan terminology and performance-testing references are based on AMCA publications and standards. Production time, delivery contents, payment, packaging, transportation, certifications, and product configuration should be confirmed in the final technical quotation and purchase agreement.