Fan Section for Air Handling Units

Product Specifications

Technical details and manufacturing context for Fan Section

Definition

The Fan Section is a critical component of an Air Handling Unit (AHU) designed to house and support the main fan or fans. Its primary function is to generate the necessary airflow and static pressure to move conditioned air through the ductwork of a building's HVAC system. This section typically includes the fan assembly, motor, drive system (e.g., belts, pulleys, or direct drive), and structural housing. It is engineered to manage airflow rates, pressure, and often includes vibration isolation and access panels for maintenance.

In an AHU, the fan section is positioned to draw air from the return or mixed-air plenum and discharge it through subsequent components such as filters, heating or cooling coils, and humidifiers before entering the supply ductwork. The fan section's design must match the overall AHU performance requirements, including airflow rate, static pressure, and efficiency. The selection of the fan type (centrifugal, axial, or others) depends on the specific application and space constraints.

The fan section is typically constructed from galvanized steel, with stainless steel available for corrosive environments. Key parameters include airflow rate (2000–60000 m³/h), static pressure (300–2000 Pa), fan speed (600–1800 rpm), motor power (0.75–30 kW), supply voltage (380 V, three-phase, 50 Hz), operating temperature (-10 to 50 °C), noise level (60–85 dB(A) at 1 m), and fan efficiency (60–85%). The casing material is typically Q235 carbon steel (galvanized optional), and the impeller is often AL6061 aluminum alloy. Weight ranges from 150 to 1500 kg, and dimensions vary from 1000×800×800 mm to 3000×2000×2000 mm.

Standards referenced include ISO 5801 for airflow and pressure testing, IEC 60034 for motor performance, IEC 60038 for voltage and frequency, ISO 3744 for noise measurement, ISO 12759 for fan efficiency, and GB/T 700 and GB/T 3190 for materials. These standards serve as verification references; actual compliance must be confirmed with the manufacturer.

For any specific application, verify model-specific values and standards with the legal manufacturer or supplier to ensure proper selection and installation.

Working Principle

An electric motor drives the fan impeller (bladed wheel), which rotates to draw air into the AHU and propel it forward. The rotation creates a pressure difference: a low-pressure area at the fan inlet that pulls air in and a high-pressure area at the outlet that pushes air through the subsequent sections (like filters, coils) and into the ductwork. The design (e.g., centrifugal, axial) determines the specific airflow and pressure characteristics.

Common Materials

Galvanized Steel, Stainless Steel (for corrosive environments)

Technical Parameters

Parameter	Typical range	Notes & selection driver
Airflow Rate	2000–60000 m³/h	Select based on AHU design point.ISO 5801
Static Pressure	300–2000 Pa	Total pressure minus dynamic pressure.ISO 5801
Fan Speed	600–1800 rpm	Affects airflow and noise.
Motor Power	0.75–30 kW	Match to fan load.IEC 60034
Supply Voltage	380 V	Three-phase, 50 Hz.IEC 60038
Frequency	50 Hz	Standard in China and Europe.IEC 60038
Operating Temperature	-10–50 °C	Ambient air temperature range.
Noise Level	60–85 dB(A)	At 1 m distance.ISO 3744
Fan Efficiency	60–85 %	Static efficiency at design point.ISO 12759
Casing Material	Q235	Carbon steel, galvanized optional.GB/T 700
Impeller Material	AL6061	Aluminum alloy for corrosion resistance.GB/T 3190
Weight	150–1500 kg	Depends on size and material.
Dimensions (L×W×H)	1000×800×800–3000×2000×2000 mm	Customizable per AHU design.

Ranges are indicative industry figures for RFQ preparation, not a supplier commitment. Confirm every value and standard with the legal manufacturer before ordering.

Components / BOM

Fan Impeller/Blade Assembly
Rotates to move air by creating pressure differentials.

Material: Aluminum, Steel, or Composite Plastics
Fan Motor
Provides the rotational force to drive the impeller.

Material: Steel housing, Copper windings
Fan Housing/Cabinet
Structural enclosure that contains the fan assembly and directs airflow.

Material: Galvanized Steel
Drive Assembly
Transmits power from the motor to the fan impeller (e.g., belts, pulleys, couplings, or direct shaft).

Material: Steel, Rubber (belts)
Vibration Isolators
Mounts or pads that reduce the transmission of vibration and noise from the fan to the AHU structure.

Material: Rubber, Neoprene, Springs

Industry Taxonomies & Aliases

Commonly used trade names and technical identifiers for Fan Section.

Applied To / Applications

This component is essential for the following industrial systems and equipment:

Air Handling Unit (AHU)

View system integration details

Manufacturers of Fan Section

Manufacturer profiles associated with Fan Section.

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Frequently Asked Questions

What is the typical airflow range for a fan section?

The airflow rate typically ranges from 2000 to 60000 m³/h, but the exact value depends on the AHU design point. Always verify the required airflow for your specific system with the manufacturer.

What materials are commonly used for the fan section casing and impeller?

The casing is often made of Q235 carbon steel, with galvanized options available. The impeller is typically AL6061 aluminum alloy for corrosion resistance. For corrosive environments, stainless steel casing may be specified.

Which standards are relevant for verifying fan section performance?

Key standards include ISO 5801 for airflow and pressure testing, IEC 60034 for motor performance, IEC 60038 for voltage and frequency, ISO 3744 for noise measurement, and ISO 12759 for fan efficiency. These are reference standards; actual compliance must be confirmed with the supplier.

How does the fan section create airflow?

An electric motor drives the fan impeller, which rotates to create a pressure difference. Low pressure at the inlet draws air in, and high pressure at the outlet pushes air through the AHU and ductwork. The specific design (centrifugal or axial) determines the airflow and pressure characteristics.

Data Basis

Editorial classification, named public sources where available, and source-reviewed manufacturer records.

Preliminary Technical Classification

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pressure:	Up to 2500 Pa static pressure (standard), higher with reinforced construction
other spec:	Air flow rate: 0.5-50 m³/s, motor power: 0.5-75 kW, max particulate concentration: 5 mg/m³ for standard units
temperature:	-20°C to 80°C (typical), up to 120°C with special materials

Fan Section