Filter Section for Air Handling Units

Product Specifications

Technical details and manufacturing context for Filter Section

Definition

The Filter Section is a critical component of an Air Handling Unit (AHU) designed to house one or more air filters. Its primary function is to remove dust, pollen, microbes, and other airborne particulates from the supply and/or return air streams, thereby protecting downstream AHU components (like coils and fans), improving indoor air quality (IAQ), and meeting cleanliness requirements for the conditioned space. It typically consists of a structural housing with access doors for filter maintenance and a mounting frame to secure the filters.

This section is available in configurations using galvanized steel or stainless steel casing materials, with the latter suited for corrosive environments. The filter section length ranges from 500 to 2000 mm, width and height from 600 to 2000 mm, and weight from 50 to 500 kg. Nominal airflow rate spans 1000 to 50,000 m³/h (ISO 580), with filter face velocity between 1.5 and 3.0 m/s. Initial pressure drop is 50 to 250 Pa (ISO 3966), and final pressure drop (indicating filter replacement threshold) is 300 to 600 Pa. Filtration efficiency classes range from G4 to H13 (ISO 16890). Operating temperature range is -20 to 60 °C, and relative humidity range is 5 to 95% RH. Casing material grades are Q235 or 304 (GB/T 700), and seal materials are EPDM or NBR.

These values are directory reference ranges and must be confirmed for the actual model and application. Standards listed are procurement references, not certifications. Always verify model-specific values and standards with the legal manufacturer or supplier.

Working Principle

Air is forced through the section by the AHU's fan. As the air passes through the filter media housed within the section, particulate matter is captured on the filter material via mechanisms such as impaction, interception, diffusion, and electrostatic attraction, depending on the filter type. The clean air then exits the section to continue through the AHU. The filter section's design ensures proper sealing and support to maintain filtration efficiency and minimize bypass. Pressure drop across the filter increases as it loads with particulates, signaling when maintenance or replacement is needed. The section's dimensions and airflow ratings must match the AHU's capacity and the required face velocity to achieve desired filtration performance.

Common Materials

Galvanized Steel, Stainless Steel

Technical Parameters

Parameter	Typical range	Notes & selection driver
Filter Section Length	500–2000 mm	Determines filter media area and maintenance access.
Nominal Airflow Rate	1000–50000 m³/h	Match to AHU capacity and filter face velocity.ISO 580
Filter Face Velocity	1.5–3.0 m/s	Higher velocity increases pressure drop and reduces efficiency.
Initial Pressure Drop	50–250 Pa	Affects fan energy consumption.ISO 3966
Final Pressure Drop	300–600 Pa	Indicates filter replacement threshold.
Filtration Efficiency	G4–H13 Class	Select based on required indoor air quality.ISO 16890
Operating Temperature	-20–60 °C	Exceeding range may damage filter media or seals.
Relative Humidity	5–95 % RH	High humidity can cause microbial growth.
Casing Material	Q235/304	Stainless steel for corrosive environments.GB/T 700
Seal Material	EPDM/NBR	Temperature and chemical compatibility.
Weight	50–500 kg	Affects structural support and installation.
Filter Section Width	600–2000 mm	Must match AHU casing dimensions.
Filter Section Height	600–2000 mm	Must match AHU casing dimensions.

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

Housing/Casing Part
Provides the structural enclosure for the filter media, ensuring airtight integrity and supporting internal components.

Material: Galvanized Steel
Filter Mounting Frame Part
A rigid frame within the housing that holds the filter media securely in place, preventing bypass and ensuring proper sealing.

Material: Galvanized Steel
Access Door
A sealed panel allowing personnel to inspect, install, and replace filters.

Material: Galvanized Steel
Filter Media Part
The actual material (e.g., pleated fabric, glass fiber) that captures airborne particles. It is a consumable item installed within the section.

Material: Synthetic Fiber, Glass Fiber
Pressure Tap Ports Part
Fittings to connect manometers or sensors for measuring the pressure drop across the filter, indicating its loading state.

Material: Brass, Plastic

Application & selection

Application Fit & Sizing Matrix

Operational Limits

pressure:	Max 2500 Pa
flow rate:	0.5 to 10 m³/s per section
other spec:	Max particulate loading: 5 g/m³
temperature:	-20°C to 80°C

Media Compatibility

✓ Pleated Panel Filters (MERV 8-13) ✓ Bag Filters (MERV 13-16) ✓ HEPA/ULPA Filters (MERV 17-20)

Unsuitable: High moisture environments with liquid droplets or condensation

Sizing Data Required

Required Airflow Volume (m³/h)
Target Filtration Efficiency (MERV/EN rating)
Available Pressure Drop Budget (Pa)

Risk, maintenance & compliance

Reliability & Engineering Risk Analysis

Failure Mode & Root Cause

Filter media blinding

Cause: Accumulation of fine particulate matter or contaminants that completely block pores, often due to inadequate pre-filtration, excessive solids loading, or improper media selection for the application.

Structural integrity failure

Cause: Fatigue cracking or collapse of filter housing/support structure from cyclic pressure differentials, mechanical vibration, or corrosion from aggressive process fluids, exacerbated by poor material compatibility or design flaws.

Maintenance Indicators

Sustained high differential pressure (ΔP) readings beyond design limits despite backwashing or cleaning cycles
Visible media bypass or particulate carryover in downstream fluid samples, indicating torn/sealed media or failed gaskets

Engineering Tips

Implement condition-based monitoring with real-time ΔP trending and particle count analysis to optimize cleaning cycles and prevent irreversible blinding
Design redundant filtration stages (e.g., coarse pre-filter + polishing filter) with bypass valves to distribute load and allow maintenance without system shutdown

Indicative industry ranges for design and RFQ preparation. Confirm the exact figures and applicable standard with the manufacturer before specifying.

Compliance & Manufacturing Standards

Applicable Standards

ISO 16890:2016 (Air filters for general ventilation) ANSI/ASHRAE 52.2-2017 (Method of Testing General Ventilation Air-Cleaning Devices) EN 779:2012 (Particulate air filters for general ventilation)

Quoted from the published standard.

Manufacturing Precision

Frame dimensions: +/- 1.5 mm
Filter media thickness: +/- 0.5 mm

Quality Inspection

Pressure drop test at rated airflow
Particle filtration efficiency test

Procurement Evaluation Criteria

A practical evidence checklist for RFQ preparation and supplier evaluation.

Technical documentation

Request current drawings, revision history, and a signed specification sheet.

Manufacturing capability

Verify equipment lists, process limits, capacity, and representative production evidence.

Inspection readiness

Confirm test methods, calibrated equipment, sampling plans, and traceable reports.

Supplier transparency

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Manufacturers of Filter Section

Manufacturer profiles associated with Filter Section.

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Frequently Asked Questions

What is the primary function of a filter section in an AHU?

The filter section houses air filters to remove particulate contaminants from the air stream, protecting downstream components and improving indoor air quality.

What materials are commonly used for the filter section casing?

Galvanized steel and stainless steel are typical. Stainless steel (e.g., grade 304) is used in corrosive environments.

How do I determine the required filter section size?

Size must match AHU dimensions and airflow capacity. Reference ranges: length 500-2000 mm, width/height 600-2000 mm, airflow 1000-50,000 m³/h. Confirm with manufacturer.

What does the final pressure drop indicate?

Final pressure drop (300-600 Pa) indicates the filter is loaded and should be replaced to maintain efficiency and avoid excessive energy consumption.

Related equipment

Applied To / Applications

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

Air Handling Unit (AHU)

View system integration details

Industrial Ecosystem & Supply Chain Structure

Complementary Systems

Downstream Applications

Specialized Tooling

Industry Taxonomies & Aliases

Commonly used trade names and technical identifiers for Filter Section.

Data Basis

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

Preliminary Technical Classification

This page supports structured research, RFQ preparation, and supplier evaluation. It does not replace buyer-led supplier qualification, standards review, or technical approval.

Compiled and source-reviewed by the CNFX editorial team. Each manufacturer above links to the page on that company's own website where the product is listed, with the date we checked it. How we source and review · Page last updated 12 October 2026

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