Camfil Filters for AHU Systems – Pre, Bag, Compact, HEPA & Molecular Air Filters

Camfil Filters for AHU Systems provide multi-stage air filtration solutions for Air Handling Units used in commercial buildings, industrial factories, hospitals, pharmaceutical facilities, food production, electronics manufacturing, semiconductor facilities, data centers and clean-process applications.

An AHU normally performs several air-treatment functions including filtration, cooling, heating, humidity control and air distribution. The filtration section protects downstream HVAC components and helps control particulate contamination in the supplied air.

Depending on the application, a Camfil AHU filtration system can include Pre Filters, Panel Filters, Bag Filters, Hi-Flo Filters, Compact Filters, Opakfil Filters, HEPA Filters, ULPA Filters and Molecular Filters.

VIETPHAT supports customers requiring Camfil Filters for AHU Systems with product identification, filter-stage selection, replacement matching, technical specification review and quotation according to dimensions, efficiency, airflow, pressure drop, frame, seal, quantity and application requirements.

What Are Camfil Filters for AHU Systems?

Camfil AHU Filters are Air Filters installed inside or associated with Air Handling Units to control airborne contaminants before conditioned air is supplied to occupied or process areas.

Depending on system design, filters can be installed in:

• Outdoor-air intake sections.
• Mixed-air sections.
• Supply-air filtration sections.
• Return-air sections.
• Recirculation systems.
• Exhaust-air systems.
• Final filtration sections.

The appropriate filter configuration depends on outdoor-air quality, indoor-air-quality objectives, process sensitivity, target contaminants, system airflow, available fan static pressure and applicable project requirements.

Camfil AHU Filter Product Range

Filter Type	Typical AHU Function	Typical Filtration Stage
Panel / Pre Filter	Coarse particle removal and equipment protection	Stage 1
Bag / Pocket Filter	Medium to fine particulate filtration	Stage 1 or Stage 2
Hi-Flo Bag Filter	Fine particulate filtration	Stage 2
Compact / V-Bank Filter	Fine filtration in compact installation space	Stage 2 / Final general ventilation stage
Opakfil	Fine particulate filtration	Stage 2
HEPA Filter	Critical particulate filtration	Final stage where required
ULPA Filter	Ultra-high-efficiency particulate filtration	Selected critical applications
Molecular Filter	Selected gas, VOC, odor or AMC control	Application-specific stage

How Does an AHU Filtration System Work?

An Air Handling Unit draws outdoor air, recirculated air or a mixture of both through one or more filtration stages before conditioning and distributing the air.

A general AHU arrangement can be:

Outdoor Air → Pre Filter → Fine Filter → Cooling / Heating Coil → Fan → Supply Air

A higher-control application can use:

Outdoor Air → Pre Filter → Fine Filter → HEPA Filter → Supply Air

Where selected gaseous contaminants must also be controlled:

Outdoor Air → Pre Filter → Fine Filter → Molecular Filter → Supply Air

The exact arrangement varies according to the application and engineering design.

Why AHU Systems Use Multiple Filter Stages

Multi-stage filtration allows different filters to handle different contaminant loads.

The first filtration stage can capture larger particles before they reach higher-efficiency downstream filters.

This can help:

• Protect cooling coils.
• Protect heating coils.
• Reduce contamination on fans.
• Keep AHU internal surfaces cleaner.
• Reduce loading on Fine Filters.
• Extend downstream filter service life.
• Protect HEPA Filters where installed.
• Support stable system airflow.

Camfil Pre Filters for AHU Systems

Pre Filters are commonly installed as the first filtration stage in an AHU.

Their principal purpose is to capture larger particulate contamination before it reaches more efficient downstream filters and HVAC components.

Camfil Pre Filter options can include:

• Panel Filters.
• Pleated Panel Filters.
• Selected Bag Filters.
• Media Pads.

Camfil states that its prefilters are intended to protect Fine Filters by capturing larger particles such as coarse particulate matter and PM10 in intake or recirculation air.

Why Pre Filters Are Important in AHUs

Without effective upstream filtration, downstream components can accumulate particulate contamination more quickly.

A correctly selected Pre Filter can help protect:

• Cooling coils.
• Heating coils.
• Heat exchangers.
• Fans.
• Fine Filters.
• Compact Filters.
• HEPA Filters.

However, adding filtration stages also adds resistance, so the total pressure drop of the complete filter train should be considered.

Camfil Panel Filters for AHU Systems

Panel Filters can be used as Pre Filters or General Ventilation Filters in AHUs.

Depending on the selected Camfil product, Panel Filters can provide:

• Coarse particulate filtration.
• PM10-related filtration performance.
• Protection of Fine Filters.
• Protection of AHU components.
• Compact installation depth.

The exact product should be selected according to tested efficiency, dimensions, rated airflow, pressure drop and operating conditions.

Camfil Bag Filters for AHU Systems

Bag Filters, also called Pocket Filters, are among the most widely used filters in HVAC and AHU systems.

Camfil identifies Bag Filters for use as:

• First-stage supply-air filters.
• Second-stage supply-air filters.
• Final filters in selected comfort HVAC applications.
• Prefilters for HEPA installations.
• Exhaust-air filters.
• Recirculation-air filters.

Bag Filters provide a relatively large filtration area and can offer high dust-holding capacity and long operating life when correctly selected.

Camfil Hi-Flo Filters for AHU Systems

Hi-Flo is an established Camfil Bag Filter family designed for HVAC and industrial air filtration.

Camfil's current Hi-Flo range uses glass-fiber media with a galvanized-steel header frame and is available in different dimensions, pocket configurations and ISO 16890 efficiencies.

Depending on the exact model, Hi-Flo is designed to provide:

• High filtration efficiency.
• Low initial pressure drop.
• High dust-holding capacity.
• Long operating life.
• Optimized air distribution through filter pockets.
• Different sizes for AHU applications.

Camfil Hi-Flo AHU Filter Construction

Hi-Flo uses multiple filter pockets to provide a large filtration surface within an AHU filter bank.

Camfil currently offers Hi-Flo configurations with different pocket counts and dimensions. The manufacturer states that higher pocket counts can be optimized for lower initial pressure drop and reduced energy consumption, while configurations with fewer pockets can provide a more economical solution for suitable applications.

Camfil Hi-Flo AHU Filter Selection

When selecting or replacing Hi-Flo Filters, specify:

• Exact Hi-Flo model.
• Camfil article number.
• ISO 16890 classification.
• Width.
• Height.
• Pocket depth.
• Number of pockets.
• Rated airflow.
• Initial pressure drop.
• Required quantity.

Face dimensions alone should not be used to identify a Hi-Flo replacement because products can have different efficiencies, pocket configurations, airflow ratings and pressure drops.

Camfil Compact Filters for AHU Systems

Compact Filters use pleated media arranged to provide a large filtration surface within a relatively compact frame.

Camfil's General Ventilation portfolio includes:

• Compact Filters with header frames.
• Compact box-type filters.

These filters can be useful where AHU installation depth is limited or where a rigid Fine Filter configuration is preferred.

Camfil Opakfil Filters for AHU Systems

Opakfil belongs to Camfil's V-shaped header-frame General Ventilation Filter range.

Camfil identifies V-shaped products such as Opakfil as commonly used as a second filtration stage in supply-air systems.

Potential applications include:

• Final filtration for comfort applications.
• Second-stage AHU filtration.
• Fine supply-air filtration.
• Second-stage pre-filtration for clean-process applications.

Selected products provide filtration performance up to ISO ePM1.

Why Use V-Shaped Compact Filters in an AHU?

A V-shaped configuration allows multiple pleated filter packs to fit inside a compact housing.

Depending on the exact model, this design can provide:

• Large filtration area.
• Compact installation depth.
• High airflow capability.
• Fine particulate filtration.
• Relatively low pressure drop.

V-shaped construction does not automatically mean HEPA. Filter geometry describes construction, while HEPA describes tested filtration performance.

Bag Filter vs Compact Filter for AHU

Parameter	Bag Filter	Compact Filter
Construction	Multiple flexible pockets	Rigid pleated packs
Installation Depth	Often deeper	Can be more compact
Media Area	High	High
Dust Holding	Typically high	Product dependent
Efficiency	Product dependent	Product dependent
Pressure Drop	Product and airflow dependent	Product and airflow dependent
Typical AHU Stage	First / Second	Second / Final general ventilation stage

The appropriate choice depends on available installation depth, required efficiency, airflow, pressure drop, dust loading and lifecycle considerations.

Camfil Filters for AHU and ISO 16890

ISO 16890 is a major current classification framework for General Ventilation Air Filters.

The principal categories include:

• ISO Coarse.
• ePM10.
• ePM2.5.
• ePM1.

Camfil's current General Ventilation portfolio contains filter designs and efficiency levels ranging from ePM10 through ePM1.

The complete tested classification of the finished filter should be considered when selecting AHU Filters.

Camfil ePM10 Filters for AHU

ISO ePM10 Filters can be used where filtration of the PM10 particulate fraction is relevant to the ventilation strategy.

Depending on the system design, these products can function as General Ventilation Filters or as upstream filtration before a finer downstream stage.

Camfil ePM2.5 Filters for AHU

Selected Camfil General Ventilation products can provide performance within the ePM2.5 category.

Where fine particulate contamination is a concern, the actual tested percentage efficiency should be reviewed together with airflow and pressure drop.

Camfil ePM1 Filters for AHU

Camfil offers selected General Ventilation Filters with performance up to ISO ePM1.

These can be considered for applications requiring greater control of fine particulate matter, including selected:

• Commercial buildings.
• Hospitals.
• Industrial facilities.
• Urban buildings.
• Clean-process pre-filtration systems.

Is ePM1 the Same as HEPA?

No.

ISO ePM1 is a General Ventilation Filter classification under ISO 16890.

HEPA Filters belong to a different high-efficiency particulate filtration category tested according to standards such as EN 1822 and ISO 29463.

An ePM1 AHU Filter should therefore not be described as HEPA unless the finished product has been tested and classified accordingly.

Camfil G4, M5, M6, F7, F8 and F9 AHU Filters

Older AHU schedules and installed filters may reference former EN 779 classifications such as:

• G4.
• M5.
• M6.
• F7.
• F8.
• F9.

These legacy classifications remain useful when identifying an existing filter or reviewing an older project specification.

For current General Ventilation Filter selection, ISO 16890 performance should be reviewed where applicable.

An exact universal one-to-one conversion between former EN 779 classes and ISO 16890 should not be assumed.

Camfil HEPA Filters for AHU Systems

Some AHU applications require higher particulate filtration than conventional General Ventilation Filters can provide.

Camfil provides EPA, HEPA and ULPA Filters for contamination-sensitive applications.

Camfil states that its EPA, HEPA and ULPA Filters are tested according to standards including:

• EN 1822.
• ISO 29463.

Potential applications include selected systems serving:

• Cleanrooms.
• Pharmaceutical plants.
• Hospitals.
• Laboratories.
• Food manufacturing.
• Electronics facilities.
• Semiconductor facilities.

Where Is a HEPA Filter Installed in an AHU?

HEPA Filters can be installed in AHUs or associated terminal systems depending on the contamination-control design.

One possible arrangement is:

Pre Filter → Fine Filter → HEPA Filter

The upstream stages help reduce dust loading on the more expensive HEPA Filter.

In cleanroom systems, terminal HEPA or ULPA filtration may instead be located near or at the room supply point.

Camfil H13 Filters for AHU

Selected Camfil high-efficiency products are available in H13 HEPA configurations.

When selecting H13 filtration for an AHU, verify:

• Required filtration class.
• Rated airflow.
• Initial pressure drop.
• Available fan static pressure.
• Filter dimensions.
• Frame.
• Gasket or seal.
• Housing compatibility.
• Required integrity testing.

Camfil H14 Filters for AHU

Selected Camfil high-efficiency products are available in H14 configurations.

H14 provides a higher HEPA classification than H13, but a higher class should not automatically be specified.

The selection should consider required contamination control, pressure drop, system airflow, housing, sealing and qualification requirements.

Can H14 Replace H13 in an AHU?

Potentially, but the replacement should first be technically reviewed.

Check:

• Required filtration performance.
• New filter pressure drop.
• Available fan static pressure.
• Required system airflow.
• Housing dimensions.
• Seal configuration.
• Validation requirements.

A higher efficiency class is not automatically a drop-in replacement.

Camfil ULPA Filters for AHU Systems

ULPA Filters can be used where ultra-high-efficiency particulate control is required.

Potential applications include:

• Advanced cleanrooms.
• Semiconductor manufacturing.
• Microelectronics.
• Highly contamination-sensitive processes.

In many applications, ULPA Filters are installed as terminal filters rather than conventional AHU General Ventilation Filters.

Camfil Absolute Filters for AHU Systems

Camfil's Absolute portfolio includes high-efficiency compact filters for critical particulate-control applications.

Camfil identifies box-type HEPA Filters such as Absolute V for use in make-up-air or recirculation units, including as final HEPA stages that can help protect terminal HEPA filtration in cleanrooms.

Selection should consider:

• HEPA classification.
• Dimensions.
• Rated airflow.
• Pressure drop.
• Frame construction.
• Seal configuration.
• Testing requirements.

Camfil Molecular Filters for AHU Systems

Particulate filters and molecular filters perform different functions.

Camfil Molecular Filters use adsorption technology to remove selected molecules, gases and vapors from air.

Depending on the adsorbent and product, target contaminants can include selected:

• Odors.
• VOCs.
• Ozone.
• Acid gases.
• Basic gases.
• Corrosive gases.
• Airborne Molecular Contamination.

Camfil states that its Molecular Filters are tested according to standards including ISO 10121 or ASHRAE 145.2.

Why HEPA Does Not Replace Molecular Filtration

HEPA and ULPA Filters are designed for particulate contamination.

Molecular Filters target gaseous molecules and vapors through adsorption or chemisorption mechanisms.

Therefore:

HEPA / ULPA = Particulate Control

Molecular Filter = Target-Specific Gas / Vapor Control

Where both contamination types are present, the AHU may require both technologies.

Camfil City-Flo Filters for AHU Systems

City-Flo combines particulate and molecular filtration within a Bag Filter configuration.

Camfil currently identifies City-Flo products with:

• ISO ePM1 particulate filtration.
• Tested ozone and VOC performance.
• Combination media for particles and molecules.
• High dust-holding capacity.

This configuration can be useful for selected AHUs treating outdoor air affected by both particulate and gaseous pollutants.

Camfil CityCarb Filters for AHU Systems

CityCarb combines particulate and molecular filtration in a compact header-frame configuration.

Selected current products provide performance up to ISO ePM1 and are tested for selected:

• Ozone.
• VOCs.
• SO2.
• NO2.
• Organic acids.

Actual suitability should be confirmed according to the target contaminant and operating conditions.

Camfil CamCarb Filters for AHU Systems

CamCarb is part of Camfil's Molecular Filter portfolio.

Camfil specifically identifies CamCarb products for Air Handling Units and filter housings.

Different adsorbents can be selected according to the target contaminant.

Potential applications include:

• Corrosion control.
• Industrial AHUs.
• Commercial AHUs.
• Outdoor-air treatment.
• Recirculation-air treatment.

Camfil GigaPleat Filters for Cleanroom AHUs

GigaPleat belongs to Camfil's Molecular Filter portfolio and is specifically identified for cleanroom AHUs and housings.

A range of adsorbents can be selected to target different Airborne Molecular Contaminants.

This can be relevant to semiconductor and other contamination-sensitive applications where particulate filtration alone is insufficient.

Typical Camfil AHU Filter Configurations

Application	Example Filtration Strategy
Commercial Building	Pre Filter → Bag / Compact Filter
Industrial HVAC	Pre Filter → Fine Bag / Compact Filter
Hospital	Pre Filter → Fine Filter → HEPA where required
Pharmaceutical	Pre Filter → Fine Filter → HEPA / Terminal HEPA according to design
Cleanroom	Pre Filter → Fine Filter → HEPA / ULPA
Semiconductor	Pre Filter → Fine Filter → HEPA / ULPA + Molecular filtration where required
Data Center	Particulate filtration + target-specific molecular filtration where required

These configurations are illustrative rather than universal specifications. Actual filtration stages should follow project requirements and system design.

Camfil Filters for Commercial Building AHUs

Commercial-building AHUs can serve:

• Office buildings.
• Shopping centers.
• Hotels.
• Schools.
• Public buildings.
• Mixed-use developments.

Filter selection should consider outdoor-air quality, occupancy, ventilation rate, indoor-air-quality objectives and fan capability.

Air filtration should be integrated with adequate ventilation, source control, humidity management and HVAC maintenance.

Camfil Filters for Industrial AHU Systems

Industrial AHUs can use Camfil Filters for:

• Factory comfort ventilation.
• Production-area HVAC.
• Equipment rooms.
• Make-Up Air Units.
• Clean-process pre-filtration.

General AHU Filters should not be confused with dedicated process dust collectors.

Processes generating high concentrations of dust, fumes or mist may require dedicated source-capture systems such as cartridge collectors, baghouses or other engineered equipment.

Camfil Filters for Hospital AHUs

Hospital AHUs can require different filtration stages depending on room function and infection-control requirements.

Potential configurations can include:

• Pre Filters.
• Fine Filters.
• High Efficiency Filters.
• HEPA Filters for selected critical areas.

HEPA is not universally required throughout every hospital. The filtration specification should correspond to the requirements of the particular clinical or support area.

Camfil Filters for Pharmaceutical AHUs

Pharmaceutical HVAC systems can use multiple stages to protect cleanrooms and manufacturing processes.

Selection should consider:

• Outdoor-air filtration.
• Fine pre-filtration.
• HEPA filtration.
• Terminal filtration.
• Room classification.
• Pressure cascade.
• Airflow pattern.
• Temperature and humidity.
• Process requirements.
• Qualification requirements.

Filter class alone does not establish GMP compliance.

Camfil Filters for Food Factory AHUs

Food and beverage facilities can require different filtration levels according to hygiene zoning and product exposure.

Applications can include:

• General production areas.
• Packaging rooms.
• High-care areas.
• Clean processing zones.
• Warehouse ventilation.

HEPA filtration can be appropriate for selected critical processes but should not automatically be specified throughout an entire food facility.

Camfil Filters for Semiconductor AHUs

Semiconductor facilities require careful control of both particulate contamination and, in selected processes, Airborne Molecular Contamination.

A particulate filtration train can include:

Pre Filter → Fine Filter → HEPA / ULPA

A separate Molecular Filter stage can be used where target-specific AMC control is required.

HEPA and ULPA Filters do not replace Molecular Filters for gaseous contamination.

Camfil Filters for Data Center AHUs

Data-center AHU filtration depends on outdoor-air usage and environmental contamination.

Important factors include:

• Outdoor particulate concentration.
• Economizer operation.
• PM1 and PM2.5 exposure.
• Corrosive gas exposure.
• System airflow.
• Filter pressure drop.
• Continuous operating hours.
• Energy consumption.

HEPA filtration is not automatically necessary for every data center. Where corrosive gases are present, target-specific Molecular Filters may also need evaluation.

How to Select Camfil Filters for AHU Systems

1. Identify the AHU Application

Determine whether the AHU serves a commercial building, factory, hospital, cleanroom, pharmaceutical plant, data center or another application.

2. Identify Target Contaminants

Determine whether the primary requirement involves coarse dust, PM10, PM2.5, PM1, critical fine particles, gaseous contamination or a combination.

3. Define the Filtration Stages

Determine whether the AHU requires:

• Pre Filter only.
• Pre + Fine Filter.
• Pre + Fine + HEPA.
• Pre + Fine + Molecular.
• Another engineered combination.

4. Select the Required Efficiency

For General Ventilation Filters, review ISO 16890 performance. For HEPA and ULPA applications, review EN 1822 or ISO 29463 classification.

5. Confirm Dimensions

Measure actual:

Width × Height × Depth (W × H × D)

6. Confirm Rated Airflow

Each filter should operate within an appropriate airflow range.

7. Review Pressure Drop

Calculate the resistance of the complete filtration train and confirm compatibility with the AHU fan.

8. Review Frame and Sealing

For critical filters, frame, gasket, gel seal and filter-housing compatibility should be verified.

9. Consider Lifecycle Cost

Evaluate purchase price, pressure drop, energy consumption, service life, maintenance and replacement frequency.

AHU Filter Airflow

Airflow is a critical parameter in AHU Filter selection.

Operating a filter substantially outside its intended airflow can affect:

• Pressure drop.
• Filtration performance.
• Energy consumption.
• Filter stability.
• Service life.

Rated airflow should therefore be compared with actual airflow through each filter position.

AHU Filter Face Velocity

Face velocity depends on airflow and filter-bank area.

Increasing velocity can increase filter resistance and influence filtration behavior.

When changing filter type or reducing the number of filters in a bank, the resulting airflow per filter should be checked.

Camfil AHU Filter Pressure Drop

Pressure drop represents resistance to airflow across the filter.

Total filter resistance affects:

• Fan static pressure.
• System airflow.
• Fan energy consumption.
• Room pressure.
• Heating and cooling performance.
• Overall AHU operation.

Both initial and loaded pressure-drop characteristics should be considered when comparing filters.

Why Low Pressure Drop Matters

The AHU fan must overcome filter resistance whenever the system operates.

A lower-resistance filter can potentially reduce fan-energy requirements when compared at equivalent operating conditions and required filtration performance.

However, filter selection should not sacrifice the required filtration efficiency simply to achieve a lower pressure drop.

Camfil AHU Filters and Energy Consumption

AHUs can operate for thousands of hours annually, making filter pressure drop an important lifecycle parameter.

Lifecycle evaluation can include:

• Filter purchase price.
• Initial pressure drop.
• Average operating pressure drop.
• Fan energy consumption.
• Filter service life.
• Replacement frequency.
• Maintenance labor.
• Disposal cost.

A lower purchase price does not necessarily mean a lower total filtration cost.

Camfil AHU Filter Size

Camfil AHU Filters are available in multiple dimensions and configurations.

For replacement, specify actual dimensions:

Width × Height × Depth

For Bag Filters, also specify:

• Pocket depth.
• Number of pockets.

For Compact Filters, identify header configuration and overall depth.

For HEPA Filters, also verify frame depth and sealing configuration.

Why Dimensions Alone Are Not Enough

Two filters with identical external dimensions can differ in:

• Filtration efficiency.
• Filter media.
• Media area.
• Rated airflow.
• Initial pressure drop.
• Dust-holding capacity.
• Frame construction.
• Seal configuration.

Replacement should therefore be based on the complete technical specification.

Camfil AHU Filter Replacement

For an existing AHU, identify each installed Camfil Filter from its product label.

Record:

• Camfil product family.
• Article number.
• Dimensions.
• Efficiency.
• Rated airflow.
• Initial pressure drop.
• Frame.
• Seal where applicable.
• Quantity.

A clear photograph of each filter label can help simplify replacement identification.

Recommended AHU Filter Schedule

AHU	Stage	Filter Type	Dimensions	Efficiency	Airflow	Qty
AHU-01	Stage 1	Pre / Panel Filter	W × H × D	Specify	m³/h	Specify
AHU-01	Stage 2	Hi-Flo / Bag Filter	W × H × D	Specify	m³/h	Specify
AHU-02	Stage 1	Pre Filter	W × H × D	Specify	m³/h	Specify
AHU-02	Stage 2	Opakfil / Compact Filter	W × H × D	Specify	m³/h	Specify
AHU-03	Stage 3	HEPA if required	W × H × D	H13 / H14	m³/h	Specify

A structured AHU Filter schedule can simplify procurement, maintenance planning, inventory control and future replacement.

When Should Camfil AHU Filters Be Replaced?

There is no universal replacement interval for every Camfil AHU Filter.

Service life depends on:

• Outdoor-air quality.
• Dust concentration.
• Operating hours.
• System airflow.
• Filter-media area.
• Upstream filtration.
• Environmental conditions.
• Allowable final pressure drop.
• Application requirements.

Where practical, differential-pressure monitoring provides useful information about actual particulate-filter loading.

Differential Pressure Monitoring for AHU Filters

As particulate filters accumulate dust, resistance generally increases.

Differential-pressure monitoring can help facility teams evaluate:

• Filter loading.
• Airflow resistance.
• Maintenance timing.
• Potential fan-energy impact.

Replacement criteria should follow the filter specification, AHU design and facility maintenance requirements.

When Should Camfil Molecular AHU Filters Be Replaced?

Molecular Filter replacement should not normally be determined by differential pressure alone.

Adsorbent media can become saturated without a significant increase in resistance.

Service life depends on:

• Target contaminant.
• Contaminant concentration.
• Adsorbent type.
• Adsorbent quantity.
• Temperature.
• Relative humidity.
• Air velocity.
• Operating hours.
• Required breakthrough level.

Critical applications may require contaminant monitoring or media-life analysis.

Can Camfil AHU Filters Be Washed?

Only products specifically designed for cleaning and reuse should be washed.

Conventional Bag Filters, Fine Filters, Compact Filters, HEPA Filters and ULPA Filters should generally be treated as disposable unless the documentation for the exact product explicitly states otherwise.

Washing an unsuitable filter can damage the media or filter structure and should not be used as a routine substitute for replacement.

Can a Higher Efficiency Filter Be Installed in an Existing AHU?

Potentially, but the upgrade should first be technically evaluated.

Check:

• Required filtration efficiency.
• Initial pressure drop.
• Expected loaded pressure drop.
• Available fan static pressure.
• Required airflow.
• Filter-bank dimensions.
• Frame compatibility.
• Seal requirements.

A higher-efficiency filter can provide improved particulate removal but may reduce airflow if the AHU fan cannot accommodate the additional resistance.

Can Another Brand Replace a Camfil AHU Filter?

A technically compatible alternative may be evaluated where equivalent products are permitted.

Comparison should include:

• Actual dimensions.
• Filtration efficiency.
• Applicable test standard.
• Rated airflow.
• Initial pressure drop.
• Media area.
• Frame construction.
• Seal configuration.
• Operating conditions.

Equal dimensions alone do not establish technical equivalence.

For validated pharmaceutical, cleanroom and other critical systems, changing filter manufacturer or type may require engineering review, testing, change control or requalification.

Camfil Filters for AHU Systems Price

Camfil AHU Filter prices vary according to the exact technical specification.

Price factors can include:

• Product family.
• Article number.
• Dimensions.
• Efficiency.
• Filter media.
• Rated airflow.
• Pressure drop.
• Frame construction.
• Seal configuration.
• Testing requirements.
• Quantity.
• Availability.
• Delivery requirements.

A generic Camfil AHU Filter price should therefore not be used as a substitute for a specification-based quotation.

Camfil Filters for AHU Systems Quotation

For accurate quotation, provide:

Parameter	Information Required
Brand	Camfil
Product Family	Hi-Flo / Opakfil / Panel / HEPA / Molecular / Other
Article Number	Exact Camfil code where available
Dimensions	W × H × D mm
Efficiency	ISO Coarse / ePM10 / ePM2.5 / ePM1 / H13 / H14 etc.
Rated Airflow	m³/h
Initial Pressure Drop	Pa
Frame	Product-specific construction
Seal	Where applicable
Application	Commercial / Industrial / Hospital / Cleanroom etc.
Quantity	Required number of filters

Frequently Asked Questions About Camfil Filters for AHU Systems

Which Camfil Filters Are Commonly Used in AHUs?

Depending on the application, Camfil AHUs can use Panel Pre Filters, Bag Filters such as Hi-Flo, Compact Filters such as Opakfil, HEPA Filters and target-specific Molecular Filters.

What Is the First Filter Stage in an AHU?

The first stage is commonly a Pre Filter designed to capture larger particulate contamination and protect downstream Fine Filters and AHU components.

What Is the Second Filter Stage in an AHU?

Depending on system design, the second stage can use a Bag Filter or Compact Filter with higher General Ventilation filtration efficiency.

Is Camfil Hi-Flo Suitable for AHU Systems?

Yes. Hi-Flo is a Camfil Bag Filter family designed for HVAC and industrial air filtration and is available in multiple ISO 16890 efficiencies and configurations.

Is Camfil Opakfil Used in AHUs?

Yes. Camfil identifies V-shaped header-frame filters such as Opakfil as commonly used for second-stage supply-air filtration.

Can an AHU Use HEPA Filters?

Yes, where required by the application and where the AHU, fan and filter housing are designed for the corresponding airflow, pressure drop and sealing requirements.

Should Every AHU Use HEPA?

No. HEPA filtration is application-specific. General commercial and industrial AHUs commonly use ISO 16890 General Ventilation Filters without HEPA.

Is ePM1 the Same as HEPA?

No. ePM1 is a General Ventilation classification under ISO 16890, while HEPA belongs to a separate high-efficiency filtration category.

Can an AHU Remove VOCs?

Selected VOCs can be addressed using appropriately selected Molecular Filters. Conventional particulate Filters are not designed primarily for gas-phase contaminant removal.

Does Camfil Have Molecular Filters for AHUs?

Yes. Camfil identifies products including CamCarb for Air Handling Units and housings, and GigaPleat for cleanroom AHUs and housings.

How Often Should AHU Filters Be Replaced?

There is no universal replacement interval. Particulate-filter replacement depends on contaminant loading, operating hours, airflow, pressure drop and system requirements.

Can AHU Bag Filters Be Washed?

Conventional Bag Filters should generally be replaced rather than washed unless documentation for the exact product explicitly identifies it as washable or reusable.

How Do I Identify an Existing Camfil AHU Filter?

Check the product label for the Camfil family, article number, dimensions, efficiency, airflow and pressure drop. A clear photograph of the label is useful for replacement identification.

How Do I Request a Camfil AHU Filter Quotation?

Provide the Camfil article number or product family, dimensions, efficiency, rated airflow, pressure drop, frame, seal where applicable, quantity and AHU application.

Contact VIETPHAT for Camfil Filters for AHU Systems

For consultation or quotation for Camfil Filters for AHU Systems, commercial HVAC, industrial ventilation, cleanrooms and critical air applications, please contact VIETPHAT:

• Zalo / Hotline: 0971 344 344
• Sales: 0827 077 078
• Sales: 0829 077 078
• Email: sales@vietphat.com
• Website: www.vietphat.com