Can the fan box be customized? Let’s first explain the performance and installation interface clearly.
Direct answer: The fan box can be customized, but customization does not start from 'what size box do I want?' but from the target working conditions and installation interface. Air volume, external static pressure, box size, air outlet direction, control method, and inspection surface all restrict each other. Only given the size, the supplier cannot judge whether the internal fan can be installed, whether the airflow organization is reasonable, and whether the performance can be achieved. The correct customization process is to first confirm the working conditions, then confirm the interface, and finally confirm the structure and control.
Aili Industry is discussingWhen choosing a non-standard fan chassis , the project is usually required to provide working parameters and installation conditions, and then determine which ones can be adjusted and which ones need to retain the standard structure.
Where is the boundary between customization and standard products?
The standard fan box is designed according to common working conditions and common interfaces, and is suitable for projects where air volume, static pressure, and installation conditions are within conventional ranges. Customization means adjusting the box size, air outlet direction, access surface, control interface or material when the standard structure cannot be met.
But customization doesn’t mean everything can be changed. The fan impeller and motor have their own performance curves and installation requirements, and the airflow channel inside the box also has minimum space restrictions. If the box is forcibly reduced to the point where the impeller cannot fit in it, or the air outlet is changed to a position where the airflow turns sharply, the performance will be significantly reduced. Before customizing, you should first confirm which are performance constraints, which are structural constraints, and which are installation constraints.
How to balance size and performance
The on-site opening or the shape of the equipment determines the box boundaries, but the fan box must still meet the air volume and resistance within this space. Changing the direction of the air outlet, reducing the cross-section, or increasing the turns in the box may change the pressure loss and noise. Merely providing 'made to this size' is not enough to complete reliable selection.
When customizing, you usually need to provide: the length, width, and height of the available installation space, the available directions and sizes of the air inlet and outlet, the air duct connection method, equipment weight restrictions, and hoisting or transportation channels. The supplier will use this to determine whether suitable fans and motors can be arranged in the space and whether the internal structure needs to be adjusted.
If space is very limited, you can consider changing the fan type or motor mounting, but performance may be affected. At this time, the work points should be recalculated to confirm that the adjusted plan can still meet the end demand. System end configurationWhen using HEPA/ULPA high-efficiency filters , the initial resistance of the filter and the resistance at the end of use should be included in the calculation of the working point. When the process requirements are higher, it can be evaluatedDoes the ULPA ultra-high efficiency filter meet the requirements?
Control interface customization is easily overlooked
DC fan cabinet customization not only involves the cabinet and air volume, but also includes the driver, speed control signal, interlocking, fault feedback and minimum operating air volume. New projects can unify interfaces during the design phase of equipment, power supplies and control cabinets; renovation projects must first take stock of the original control signals, power supply capacity, flanges and maintenance space.
The control interface customization should be clear: speed control signal type (analog, PWM or communication), signal range and terminal definition, start and stop mode, fault feedback type, action after disconnection, and minimum operating air volume. These contents should be reflected on the electrical diagram rather than being determined by the electrician on site after the equipment arrives.
If the project requires status reading by the building control system, it should also be confirmed whether the operating feedback and fault feedback are independent signals or obtained through communication. The terminal definitions of different drives may be different. Please check with the electrical diagram and terminal description before on-site wiring.
Clean room ceiling air supply is comparableFFU fan filter unit ; centralized management of multiple devices can be matchedThe FFU computer group control system realizes zone speed regulation and status monitoring. Protection of single process equipment can be consideredEquipment-side fan filter unit (EFU) . The final filtered air supply at the end of the air duct can beHigh-efficiency air supply outlet (HEPA BOX) . The interface conditions between these devices and the customized fan box are different and should be clearly specified on the system flow diagram.
Determine maintenance methods at the drawing stage
In addition to the flange and hole positions, the orientation of the access door, motor disassembly and assembly path, vibration reduction method, power supply location and lifting constraints should be given. For projects that require long-term continuous operation, common working conditions and maintenance accessibility should also be stated.
The maintenance method is determined at the drawing stage, which is more cost-effective than adjusting after installation. For example: which side of the access door is opened depends on which direction the maintenance personnel approach the equipment; the direction in which the motor is extracted depends on whether there is enough straight space in the machine room; the filter replacement path depends on the installation position of the end filter. These contents should be marked on the equipment diagram instead of just writing 'reserved space for maintenance'.
Customized confirmation forms should not omit test conditions
Structural customization will change the internal airflow path, and acceptance cannot be based solely on the box assembly dimensions. The confirmation form should also indicate the target working conditions, noise measurement conditions and control actions that need to be verified; when adding filters or modifying air ducts on site later, it can also be used to determine whether the original design boundaries have been exceeded.
The confirmation sheet should at least include: design air volume and common air volume, corresponding external static pressure, machine input power, noise measurement distance and speed, control signal type and terminal definition, fault feedback requirements, minimum operating air volume, air outlet direction and size, access door direction, driver installation location, and power supply conditions. Power figures for test conditions are missing and cannot be used for acceptance.
Turn customized results into acceptance conditions
Aili Industry covers supporting links such as fans, motors, controls and sheet metal structures, and can be discussed according to the drawingsNon-standard fan chassis . When confirming the plan, it is recommended to list the air volume, external static pressure, input power, control function and external dimensions of the whole machine to avoid only inspecting the appearance without inspecting the operating performance.
These data should be measured during acceptance and the valve opening, filter status and rotation speed should be recorded. It is impossible to judge whether the equipment meets the design requirements by only checking the box size. Specific structure and configuration options can be found inIt is confirmed in the fan box product catalog that non-standard projects should provide equipment or machine room drawings, and then shape them based on the determined working points and on-site interfaces.
