Air conditioning box and air handling unit

Configure air treatment equipment suitable for the project according to air volume, filtration, temperature and humidity, and installation conditions.

Aili Industry provides combined air conditioning units, purification air conditioning units, fresh air treatment units, clean room fresh air treatment units (MAU), circulating air treatment units and constant temperature and humidity purification air conditioning units, which can be configured according to horizontal, vertical or ceiling-mounted installation conditions. Relying on motors, fans, filters, control systems, sheet metal and complete machine assembly capabilities, we provide selection and customization support for industrial plants and clean room projects.

Submit selection requirements →

Functional segments are combined on demand. Fans and filtration are synergistically matched. The structure and interface support customized control methods. Confirm by project.
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an air conditioning box ?What is


The air conditioning box is a device used to centrally process air. It is also often called an air handling unit in engineering. It is called Air Handling Unit in English, or AHU for short. The equipment can be combined with air filtration, cooling, heating, humidification, mixing and air supply functions according to project needs to process fresh air, return air or mixed air.
When selecting an air conditioning box, it is necessary to clarify the air source, air supply target, system resistance and installation and maintenance conditions at the same time. When used in clean rooms, it should also be designed together with terminal filtration, air flow organization and new exhaust systems.


Quick navigation: Air conditioning box products → Function configuration → Selection parameters → Industry applications → Manufacturing and customization → Frequently asked questions →

according to project requirementsSelect air conditioning box products


The following are some of Aili Industrial’s air conditioning box products. The functional direction can be determined first according to the air treatment tasks, and then the installation form can be selected based on the on-site space. Functions, installation forms and customization requirements can be combined and confirmed.

Already have design parameters or installation drawings? You can submit air volume, external static pressure, air inlet and outlet status, available space, filtration and control requirements to further communicate on non-standard air conditioning box configurations.

Submit customization requirements for air conditioning boxes →

Air conditioning box functions and configurations

Focusing on air filtration, temperature and humidity treatment and air supply needs, functional sections are combined according to project working conditions, and suitable air handling unit configurations are matched.

AILI Industrial Modular Air Handling Unit - AILI Industrial Modular Air Handling Unit

It is suitable for projects that require centralized processing of fresh air, return air or mixed air. Functional sections such as filtration, cooling, heating, humidification and air supply can be combined as required.

AILI Industrial purification type combined air conditioning box, showing the upper and lower layered boxes, air outlets and access panels; cleanroom modular air handling unit with stacked sections, air openings and access panels.

For clean room air treatment projects, combined with filtration requirements, temperature and humidity conditions, box sealing and maintenance requirements, it is configured together with the terminal air supply system.

AILI Industrial fresh air handling unit, showing an orange frame, an air grille and a top duct connection; fresh air handling unit with an orange frame, an air grille and a top duct connection.

It is used for filtration and temperature and humidity treatment of outdoor fresh air. The processing capacity and functional configuration are determined according to the fresh air volume, outdoor design conditions and air supply targets.

AILI Industrial clean room fresh air treatment unit MAU, showing the sectional box, air openings and pipe connections; cleanroom make-up air unit with sectional housing, air openings and pipe connections.

Used for clean room air supply, the configuration is determined based on the exhaust air volume, pressure difference target and air supply status, and operates in coordination with the FFU or other terminal equipment in the project.

AILI Industrial recirculating air handling unit, showing horizontal sectioned box, side air opening and access doors; recirculating air handling unit with horizontal sections, a side air opening and access doors.

It is used for filtration, cooling and air supply of the return air circulation system, focusing on checking the return air status, processing load, circulating air volume and system resistance.

AILI Industrial constant temperature and humidity cleanroom AHU with a control display, access doors and pipe connections. Temperature and humidity controlled cleanroom AHU with a control display, access doors and pipe connections.

It is suitable for production and testing environments that require temperature and humidity adjustment and air filtration. The configuration is determined according to the temperature and humidity target, allowed fluctuations and load changes.

AILI Industrial horizontal air handling unit, showing horizontal box body, air outlet grille and side pipe connections; horizontal air handling unit with an air grille and side pipe connections.

It is suitable for machine rooms with horizontal layout space and arranges functional sections based on the length of the unit, the direction of the air duct, the transportation channel and the maintenance side.

AILI Industrial vertical air conditioning box, showing the vertical box, lower air grille and side pipe connections; vertical air handling unit with a tall cabinet, a lower air grille and side pipe connections.

It is used for filtration and temperature and humidity treatment of outdoor fresh air. The processing capacity and functional configuration are determined according to the fresh air volume, outdoor design conditions and air supply targets.

AILI Industrial ceiling-suspended air handling unit with lifting lugs, a side air opening and bottom panels.

It is suitable for equipment spaces with hoisting conditions, focusing on confirming the available net height, structural load-bearing, vibration reduction, drainage and access opening locations.

AILI Industrial non-standard customized air conditioning box, showing L-shaped sectional housing, air openings and access panels; custom air handling unit with L-shaped sectional housing, air openings and access panels.

For projects that are difficult to match with standard sizes or conventional layouts, customized solutions can be communicated based on the installation space, air treatment process, interface direction and control requirements.

Air treatment functions and installation forms can be combined and selected. Aili Industrial can further confirm the functional sections, fans, filters, box structures and control configurations based on project parameters.

with the air conditioning box ?What air treatment functions can be configured

functional unit Main function functional unit Main function
New return air mix Introduce and mix air according to system requirements air filtration Configuring particulate matter filtration according to division of labor
Cooling and dehumidification Process according to air condition and cold source conditions Heating and reheating Configure according to air supply needs in winter or after dehumidification
air humidification Configured by humidity target and water vapor conditions Fan air supply Match internal resistance and external static pressure
chemical filtration Evaluate configuration based on target gas and working conditions Noise reduction and maintenance Balancing acoustic requirements with maintenance operations

The filtration configuration should be determined based on the inlet air conditions, functional section layout, terminal equipment and maintenance conditions. When it comes to chemical filtration, it is necessary to clarify the target pollutants, concentration range, temperature and humidity, and allowable resistance; when it comes to high-efficiency filtration, it is necessary to check the efficiency, air volume, resistance, and installation sealing at the same time.

an air conditioning box ?What parameters need to be confirmed when selecting

Selection items Conditions to be provided Selection items Conditions to be provided
Air volume and fresh air ratio Total supply air volume, fresh air volume, return air volume External static pressure External air ducts, valves and end resistance
Air intake status Outdoor design conditions and return air status Air supply target Temperature, humidity or dew point requirements
Hot and cold source Available in cold water, hot water or steam conditions air filtration Level, resistance and installation location
Installation space Outline boundaries, clear height and transportation channels Interface direction Air inlet and outlet, pipe and drainage locations
Fans and power supplies Working point, speed regulation and on-site power supply control interface Start, stop, monitor, alarm and linkage
maintenance conditions Access side and component replacement space Project information Drawings, parameter tables and acceptance requirements

The unit parameters are based on the selection results under agreed working conditions. Fan selection should take into account the resistance of the functional section inside the machine and the static pressure outside the machine, and consider the change in resistance during the use of the filter; the temperature and humidity processing capacity should be calculated based on actual air conditions and loads. Submit the target gas and consult the medium configuration →

Application of air conditioning boxes in clean rooms and industrial plants

02_AILI_Industrial_Cleanroom_Air_Handling_Applications_AILI industrial clean room air conditioning box application scenarios
The air-conditioning box is responsible for centralized air treatment tasks, and the FFU, high-efficiency air supply vents and other terminal equipment are responsible for regional air supply or terminal filtration tasks according to the system division of labor. Different equipment needs to jointly check the air volume, resistance, interface and control conditions to avoid determining the entire system based on the parameters of only one equipment.
Application direction Selection points of concern
Semiconductor and Electronic Manufacturing Air supply, filtration, temperature and humidity and terminal system matching
Precision Manufacturing and Optical Instruments Temperature and humidity targets, load changes and air supply organization
Biomedicine and Medical Devices Project filtration requirements, cleaning maintenance and new exhaust coordination
Food and cosmetics workshop Fresh air supplement, air filtration and maintenance conditions
Laboratory and testing areas Fresh air volume, exhaust air supply and operating period
Renovation of existing systems Original machine room space, air duct interface and control compatibility

Aili industrial air conditioning boxesManufacturing and customization of

Custom air handling unit configuration illustration showing L-shaped sectional housing, air openings and access panels.
Aili Industrial Motor R&D and Production(1)(1)

Motor and fan synergy

Aili Industrial has motor manufacturing and independent fan R&D and production capabilities, and can check the fan configuration based on the design air volume, internal resistance, external static pressure and operating mode.

Aili Industrial Intelligent Group Control System

Control system software and hardware development

Control system software and hardware development: Can communicate start and stop, speed regulation, operating mode, temperature and humidity monitoring, filter pressure difference prompts and equipment linkage based on project needs. Specific functions and communication interfaces are confirmed in the planning stage.

Aili Industrial FFU production sheet metal production

Filter matches the whole machine

Determine the structure based on functional sections, insulation, drainage, air inlets and outlets, and maintenance requirements. The technical and manufacturing resources of Suzhou and Guangde are coordinated to provide support for project selection, non-standard development and batch matching.

Aili Industrial FFU high-efficiency filter production workshop

Filter matches the whole machine

Relying on the air filter manufacturing capabilities, we simultaneously confirm the filtration level, rated air volume, resistance, installation sealing and replacement space, so that the filter configuration is consistent with the box and air supply conditions.

Aili Industrial FFU strict testing

Quality inspection and process control

Combining component inspection, production process inspection and complete machine operation testing, check key items such as air volume, operating status, filter installation and sealing according to project requirements, check whether product configuration and assembly quality comply with the confirmation plan, and provide a basis for equipment delivery, installation, commissioning and subsequent maintenance.

Aili industrial product demand technical communication

Communicable customized projects

Box shape and segmented functional segment combination and sequence air inlet and outlet and pipe connection direction, maintenance side and maintenance space filtration configuration and sealing operation mode and control interface.

Project support advantages for large factories


Aili Industry has a 30,000-square-meter production base. The production area covers motors, fans, filters, control systems, sheet metal processing, complete machine assembly, product testing, and finished product management. For air conditioning box projects, complete site and manufacturing zoning provide the organizational basis for raw material entry, filter production, structural component processing, process inspection, finished product storage and packaging delivery.


The project value of large-scale production bases is mainly reflected in multi-category collaboration, parallelization of standard and non-standard products, batch project organization, and supporting communication of filters and clean equipment.

Aili Industrial 30,000 square meters modern industrial plant
Aili Industrial FFU production sheet metal production

Sheet metal processing

Aili Industrial FFU production

Whole machine assembly

Aili Industrial FFU strict testing

Product testing

Aili Industrial FFUEFU and other purification equipment warehouse

Finished product area

Frequently Asked Questions about Air Conditioning Box Selection

Q1: What is the difference between an air conditioning box and an air handling unit?

A: Air-conditioning box is a common product name, and air handling unit corresponds to the English AHU, which is a wider equipment name. Whether it is combined, handles fresh air or return air, and whether it has temperature and humidity processing functions needs to be confirmed with the specific configuration.

Q2: How to choose between air conditioning box and fan box?

A: When the main demand is to transport air, you can focus on the fan box; when centralized processing such as filtration, cooling, heating or humidification is required at the same time, the air conditioning box and its functional section configuration should be evaluated. It is ultimately determined based on system tasks and parameters.

Q3: What is the relationship between MAU and AHU?

A: AHU is the collective name for air handling units; MAU ​​usually refers to the unit responsible for air supply. The clean room MAU needs to be designed based on the outdoor air condition, supplementary air volume, exhaust air volume and pressure difference target, and cannot directly apply the load and configuration of the return air unit.

Q4: Does the air-conditioning box come with its own refrigeration system?

A: You cannot judge based on the name alone. Air-conditioning boxes using cold water coils need to be equipped with an external cold water system. The form of cold and heat sources, connection conditions and control facilities should be specified during model selection.

Q5: Can the air-conditioning box reach the clean room level by installing a HEPA filter?

A: The clean room grade also depends on conditions such as terminal layout, air flow organization, return and return air volume, sealing, personnel and process load, etc., and should be confirmed through overall design, debugging and testing.

Q6: Can I determine the model of the air conditioning box only by knowing the air volume?

A: Air volume is only a basic parameter. It is also necessary to confirm the external static pressure, inlet and outlet air conditions, cold and heat sources, filter configuration, installation space and operation requirements in order to further calculate the unit size and processing capacity.

Q7: Can the air conditioning box size and air inlet and outlet direction be customized?

A: Aili Industrial can communicate the overall dimensions, functional section layout, interfaces and maintenance direction according to the project conditions. When sizing, you need to leave space for filter replacement, fan inspection, and other component maintenance.

Q8: What supporting support can Aili Industrial provide for air conditioning boxes?

A: Aili Industrial can combine motors, fans, filters, control systems, sheet metal and complete machine assembly capabilities to provide selection and customized matching, and can communicate with FFU, HEPA and ULPA filters, high-efficiency air outlets and chemical filters simultaneously with system interfaces.

Air conditioning box selection and technical consultation


The air conditioning box needs to be matched with the air handling objectives, cooling and heating sources, air duct system and control requirements. The design air volume, external static pressure, air inlet and outlet status, filtration requirements, and installation and maintenance conditions are clearly defined in advance to facilitate the determination of functional sections and complete machine configuration.


Contact Aili Industry immediately to obtain air conditioning box product information and selection support

→ Consult the configuration of combined air conditioning box and MAU → Submit air volume, static pressure, temperature and humidity requirements

→ Communicate about non-standard sizes and air inlet and outlet interfaces → Understand the filter and control system matching


Aili Industrial combines core components and complete machine manufacturing capabilities to provide equipment and technical support for industrial plants, clean rooms and air treatment projects.


Contact Aili Industrial to obtain air conditioning box information and technical parameters

Customized chemical filter solutions for your special needs

Aili Industry - From air filters to clean air supply equipment, it provides product matching and technical support for clean rooms and production equipment.

Still want to know more about the technical issues of air conditioning boxes?

View more air conditioning box selection and technical issues to obtain more complete air conditioning box knowledge and solutions.
  • How should the filtration target be determined when the photoresist is sensitive to alkaline gases?
    This article explains that when the photoresist is sensitive to alkaline gases, the filtration target should be determined based on the specific photolithography process, material and equipment requirements. General deodorization standards or some universal AMC values ​​cannot be directly regarded as requirements for the entire photolithography area. The article follows four steps: clarifying sensitive objects and detection calibers, assigning targets to actual protection locations, applying check points, verification and subsequent use. It points out that ammonia and amines should be distinguished and the actual use location of photoresist should be verified.
  • Can the chemical filtration section of the air conditioning box take into account both acid gas and organic gas?
    This article explains that the chemical filtration section of the air conditioning box can be evaluated to handle acid gases and organic gases at the same time, but the media must be configured for specific components and the mixing load must be checked. The multi-gas name alone cannot guarantee that all acid gases and organic matter are effective. The article starts with four steps: first determining whether the filter has passed through the same filter section, comparing combinations and system conditions, application check points, verification and subsequent use, and points out that internal and external gas sources should be handled separately when they come from different sources.
  • Can different chemical filter materials be mixed in the same project?
    This article explains that the same project can evaluate the use of different chemical filter media, but their respective goals, combination sequence, environmental suitability and maintenance methods should be clearly defined. Putting different media together does not mean that the efficiency and capacity of mixed gases can be simply added. The article is divided into four links: distinguishing stratified and mixed configurations, verifying target gases item by item, application check points, verification and subsequent use, and points out that the combined configuration needs to be confirmed separately for each target gas.
  • Can cleaning agent safety data sheets be used for chemical filter selection?
    This article illustrates that cleaning agent safety data sheets can provide clues to the composition and properties of chemical filters, but they cannot replace on-site air testing. When selecting, you also need to understand the cleaning method, temperature, dosage, exhaust air and the actual gas entering the filter section. The article follows four steps: forming an investigation direction from chemical information, connecting documents with actual use, applying check points, verification and subsequent use. It points out that the occupational exposure limits in SDS cannot be used as filter outlet concentration targets.
  • There is a high-efficiency filter in the clean room, why is there still smell?
    This article explains that there is still an odor after installing a high-efficiency filter in a clean room. The common reason is that the odor comes from gas or steam, and HEPA is mainly responsible for particle filtration. The article is divided into four links: qualified particles do not mean gas control, locating the source along the air path, application check points, verification and subsequent use. It points out that increasing the particle filtration level cannot automatically solve molecular pollution, and requires separate detection objects and treatment plans.
  • What non-particulate contamination can pharmaceutical plant chemical filters handle?
    Pharmaceutical shop chemical filters can be configured for matching gaseous contamination, such as specific organic gases or external odors. It is not a substitute for the respective control measures required for particulate, biofouling and process emissions.
  • Does the air volume in the chemical filter quotation include all modules?
    The air volume in the chemical filter quotation may be the rated air volume of a single module, or it may be the designed processing capacity of the entire set. The caliber needs to be clearly stated in the quotation. The number of modules, series-parallel relationship and actual allocation determine the system capability and cannot simply be added up by quantity.
  • After the clean room is expanded, will the original chemical filtration capacity be enough?
    After the clean room is expanded, whether the original chemical filtration capacity is sufficient requires rechecking the treatment air volume, gas load, area sensitivity and air path. The increase in area is not necessarily proportional to the load, but the original plan cannot be used directly.
  • What terms should be included in a chemical filter purchase specification?
    The chemical filter procurement specification should include target gas, air volume, environmental conditions, structural interfaces, performance basis and acceptance method. A complete description will allow the supply to correspond to project requirements, and avoid just writing about dimensions and general removal rates.
  • The clean shed is open all around, how to judge whether the chemical filtration is effective?
    When evaluating chemical filtration effects in a clean booth with surrounding open areas, it is necessary to focus on checking the entry of untreated air and local airflow coverage. Good performance at the outlet of the filter section does not necessarily mean that the gas concentration in the entire open area has been controlled.
  • How to check chemical filter manufacturer selection recommendations with project requirements?
    Check the chemical filter manufacturer's selection recommendations and correspond to the target gas, air volume, environment, interface and acceptance requirements one by one. Recommended models or brand experience cannot replace performance and adaptation evidence with clear conditions.
  • What configurations are the price of chemical filters mainly determined by?
    The price of chemical filters is mainly affected by the type and quantity of media, structural size, effective area, sealing method and scope of supply. Quotation comparison should be based on the same target gas and usage conditions, and cannot just compare each price.
  • The factory is close to the pollution source. How to match the relocation of the air inlet with chemical filtration?
    When the factory is close to the pollution source, the air inlet migration and chemical filtration should be compared with the measured load at the inlet, wind direction and system conditions. Improving the input location can reduce partial loads, but increased distance alone does not guarantee a solution to the gas problem.
  • Why should the chemical filter quotation indicate the type of filter material?
    The chemical filter quotation indicates the type of filter material, which helps to confirm the target gas, capacity and usage conditions, and avoids comparing inequivalent products based only on appearance and price. Quotes should also be understood in conjunction with media configuration and relevant performance data.
  • The clean room is contaminated by acid gas and solvent at the same time. How to combine filtration solutions?
    When there is acid gas and solvent contamination in the clean room at the same time, the specific components, loads and sources should be identified respectively, and then layered, series or partitioned treatment should be evaluated. Multi-gas labels should not be taken as proof that all acid gases and organics meet the requirements.
  • What parameters need to be provided for chemical filter inquiry?
    Comparing chemical filter plans and prices requires clarifying the target gas, concentration range, processing air volume, size interface and usage environment. Only with complete parameters can we compare whether different configurations serve the same protection goal.
  • How much will the added resistance of the chemical filter increase the fan's electricity consumption?
    The amount of fan power consumption increased by the new resistance of the chemical filter needs to be calculated or measured based on the actual air volume, fan efficiency, control method and operating time. You cannot promise a uniform increase in power consumption based on just one pressure difference value.
  • Does chemical filtration modification require re-balancing of air volume?
    When chemical filtration modifications change system resistance or branch distribution, it is often necessary to recheck the air volume balance. Even if the total air volume does not change much, the supply air, return air and pressure difference in each area may still change.
  • How to check the original motor load when rebuilding a chemical filter?
    Checking the original motor load for chemical filter modification requires a combination of fan performance, control settings and actual operating measurements. The changes in air volume and power after adding resistance are affected by the fan type and control method, and cannot simply be assumed to be overloaded or power-saving.
  • What dimensions should be covered by on-site measurements for chemical filtration retrofits?
    Chemical filtration modification measurements should cover the clear opening of the filter frame, installation depth, sealing contact surface, compression structure and removal path. It is also necessary to pay attention to the wind path, load-bearing and peripheral equipment, and should not just measure the length, width and height.
  • Can old equipment still undergo chemical filtration modification without drawings?
    Old equipment without drawings can still evaluate chemical filtration modifications through on-site measurements and operational surveys, but interface, fan and structural verification cannot be skipped. Hidden spaces and conditions that cannot be confirmed should be clarified before design.
  • Can chemical filters be installed step by step in different areas?
    Chemical filters can be evaluated and installed incrementally by area, provided that the pollution paths and ventilation connections in each area are clear. Phased implementation does not mean that the areas are completely independent. Shared return air or external input may still affect the overall effect.
  • How long does it take to stop production before chemical filtration modifications can be implemented?
    Chemical filtration retrofit downtime depends on the scope of work, installation location, cleaning recovery and acceptance steps, and there is no universal set number of hours. A plan including construction, cleaning, commissioning and verification should be given after the on-site verification is completed.
  • How to avoid affecting the room pressure difference by modifying the chemical filter?
    To avoid affecting the room pressure difference, the chemical filter modification needs to check the balance of supply air, return air and exhaust air at the same time. New resistance may change the air supply volume, and you cannot just rely on restoring a certain fan speed to ensure a stable room pressure difference.
  • Can a chemical filtration retrofit retain the original HEPA filter?
    Chemical filtration modifications can usually be evaluated to retain the original HEPA, but only if the original filter element and seal meet particle requirements, and the new filter section does not damage the air volume and structure. The division of labor between gas phase filtration and HEPA is different. Adding a chemical filter layer does not mean that the original HEPA can be canceled at will.
  • Does adding a chemical filter to an old air conditioning system require a fan replacement?
    Adding a chemical filter to an old air conditioning system does not necessarily require replacing the fan, but the operating point and target air volume under the new resistance must be checked. Being able to increase the speed or continue running does not mean that the motor load, noise and air supply are all suitable.
  • What conditions should be evaluated first before adding a chemical filter to an existing clean room?
    Before adding a chemical filter to an existing clean room, the source and target of pollution should be clarified first, and then the filter position, fan margin, installation space and maintenance conditions should be checked. The modification plan cannot be determined solely based on the size of the existing filter frame.
  • How to deal with dust falling on the surface of chemical filter?
    When there is dust on the surface of the chemical filter, you should first confirm the dust accumulation level, front-end protection and product maintenance instructions. Water washing, beating or high-pressure blowing cannot be used by default; removing dust does not mean restoring gas processing capabilities.
Aili Industrial develops and manufactures FFU, EFU, HEPA/ULPA air filters, high-efficiency air supply vents, fan boxes and other clean air equipment. Relying on motors, fans, control systems, filters and complete machine supporting capabilities, we provide selection and customization support for clean room and production equipment projects.

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