Our Products

AHU (Horizontal Type)

Air Volume: 2000 - 60000m3/h

Cooling Capacity: 194kW - 492kW

Air Volume: 2000 – 60000m3/h

AHU (Vertical Type)

Air Volume: 2000 - 60000m3/h

Cooling Capacity: 194kW - 492kW

Air Volume: 2000 – 60000m3/h

AHU (Ceiling Type)

Air Volume: 2000 - 16000m3/h

Cooling Capacity: 194kW - 492kW

Air Volume: 1000 ~ 6000m3/h

Coefficient of Performance: 3.2

Working Conditions: -5°C – 43°C

GRAD offers three series of air-handling units to meet customers’ need of cooling, heating, humidification, dehumidification and so on. It is widely applied in hotels, theaters, shopping malls, office buildings and a variety of places requires comfortable environment. It also can be used in electronics, chemical, medical, pharmaceutical, food, engineering, and other industrial buildings.


Frame Structure

Aluminum framework structure is adopted, which is made of high-strength aluminum alloy. Each corner of framework is made of special castings, allowing section bar to plug into it.

Good performance in mechanical strength, light in weight, corrosion resistance, beautiful shape and accurate size.

Flexible assembly, convenient to install, remove and perform maintenance. Longer service life than steel structure.

Panel Structure

The panel is formed by two layers of colored steel plates.

Filler between the layers is high-density polyurethane or polystyrene, which has a better performance in thermal isolation than other materials like glass wool.

No thermal bridge will be produced while working in all weather or working conditions.

Panels are fixed in a special way, with sealing material to strengthen its thermal and air resistance.

Structure has the best performance in thermal isolation, noise reduction and intensity, so it can be used in places that require high quality of air.

Fan & Electrical Motor

Unit adopts centrifugal fan with both air inlet. The fan runs smoothly in the rigorous static and dynamic balance test.

With ball bearings sealed, and functions of pre-lubricating, self-aligning, self-locking, automatic thrust, etc., the fan is maintenance-free in normal use.

Fans of a small model unit are driven directly by external sub-motor, no belt, and easy to maintain.


The selected parameters of surface air cooler are designed by CAD/coil software.

A standard cooler normally has copper pipes of φ6.

It is tightened by an overall rise up of brass strung by corrugated aluminum fin tubes.

Staggered copper pipes have good heat transfer performance, low airflow resistance and superior corrosion resistance, ensuring the cooler has a higher heat transfer coefficient and a longer life.


Widely used in hotels, theaters, shopping malls, and office buildings. It also can be used in electronics, chemical, medical, pharmaceutical, food, engineering, and industrial buildings.

Technical Data

Unit Specifications and Model Introduction

NOTE: Method to decide units type: facing the air inlet (i.e., along with air-flow direction), if the inlet and outlet tube is on the left, it is left form, if on the right, it is right form.

According to client’s specific need, our company can configure additional electrical protection devices and air quantity speed regulation (including variable frequency controller and thyristor controller).

Structures Corresponding with External Air Duct

NOTE: As displayed above, “A” is the default choice.

Air Handling Unit Performance (Table I ~ Table VI)


Air-conditioning working condition means that the dry bulb temperature of intake air is 27℃, wet bulb 19.5℃ while cooling, and dry bulb 21℃ while heating.


Fresh air working conditions means when cooling, dry bulb temp. of intake air is 350℃, wet bulb temperature 28℃, dry bulb temp. of intake air -5℃ while heating.


Cold water temperature: supply water is 7℃, back water is 12℃. Hot water supply temperature is 60℃.


The motor power values from table I to tableVI correspond with its different residual pressure. The residual pressure is flexible, which can be decided by our customers according to needs.


The noise values from table I to table VI are tested in the muffling section 1m (GB/T9068) away from each surface of the units.


Cooling capacity ratio changes with refrigerants temperature:


Cooling capacity ratio changes with wet bulb temp. of intake air:



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+1 (949) 922-0866

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Costa Mesa, CA

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Here at GRAD, we are Central Air Conditioning System Customization Experts & Trusted Manufacturer of Fiberglass Reinforced Plastic Products worldwide. The production and installation capabilities of our team ensures excellent performance and on time delivery.