Camfil Filters for FCU Systems – Fan Coil & Low Pressure Drop Air Filters

Camfil Filters for FCU Systems provide compact air filtration for Fan Coil Units used in commercial buildings, hotels, offices, hospitals, apartments and other air-conditioning applications.

A Fan Coil Unit typically contains a fan, heating and/or cooling coil, condensate system and Air Filter within a relatively compact enclosure. Unlike a large Air Handling Unit, many FCUs have limited space and limited available fan static pressure. For this reason, the Air Filter should provide the required particulate protection without creating excessive airflow resistance.

Camfil currently offers dedicated Fan Coil Filters designed to stop large dust particles from building up on heating and cooling coils. The current Camfil Fan Coil Filter specification uses progressively built-up thermally bonded polyester-fibre media and is available in multiple dimensions and airflow ratings.

VIETPHAT supports customers requiring Camfil Filters for FCU Systems with existing-filter identification, dimensional matching, technical selection, replacement support and quotation according to FCU dimensions, airflow, pressure drop and application requirements.

What Is an FCU?

FCU stands for Fan Coil Unit.

An FCU is a terminal HVAC unit that uses a fan to circulate air through a heating or cooling coil.

FCUs are commonly installed in:

• Office buildings.
• Hotels.
• Apartments.
• Hospitals.
• Schools.
• Shopping centers.
• Commercial buildings.
• Residential developments.

Depending on the HVAC design, the FCU can recirculate room air or operate in conjunction with a separate fresh-air system.

What Is a Camfil FCU Filter?

A Camfil FCU Filter is an Air Filter installed at or near the air intake of a Fan Coil Unit.

Its principal functions can include:

• Capturing larger airborne dust particles.
• Reducing dust accumulation on cooling coils.
• Reducing dirt accumulation on heating coils.
• Protecting the FCU fan and internal surfaces.
• Helping maintain heat-transfer performance.
• Reducing unnecessary coil cleaning.

Camfil specifically states that its Fan Coil Filters are designed to stop large particles from accumulating on heating and cooling coils because dust buildup can reduce coil efficiency.

Camfil Fan Coil Filters

Camfil currently offers dedicated Fan Coil Filters within its General Ventilation Filter portfolio.

Published Camfil specifications identify:

Parameter	Camfil Fan Coil Filter
Application	Protection of heating and cooling coils from dust and dirt buildup
ISO 16890	ISO Coarse 50%
Legacy EN 779 Reference	G3
Media	Synthetic polyester fibre
Frame	Metal
Published Depth	4 mm for listed configurations
Published Initial Pressure Drop	25 Pa at listed rated airflow
Maximum Temperature	70°C
Relative Humidity	Up to 100% according to current product data

Camfil FCU Filter Media

Camfil describes its current Fan Coil Filter media as progressively built-up thermally bonded polyester fibre.

Synthetic polyester media can be suitable for FCU applications because it can provide coarse particulate capture within a relatively thin filter construction.

The actual filtration performance should always be based on the tested finished filter rather than assuming an efficiency from the media material alone.

Camfil FCU Filter Efficiency

Current Camfil Fan Coil Filter data identifies the product as:

ISO Coarse 50%

under ISO 16890, while the manufacturer's current product table also retains the former:

G3

EN 779 reference.

The current ISO classification should normally be used for new technical specifications, while the legacy G3 designation can remain useful when identifying existing FCU filters or older maintenance schedules.

Camfil G3 Fan Coil Filter

Many older HVAC maintenance documents use the term G3 Filter for Fan Coil Units.

G3 belongs to the former EN 779 classification system.

Camfil's current Fan Coil Filter documentation lists both the legacy G3 designation and ISO Coarse 50% classification.

When replacing an older G3 FCU Filter, it is still important to verify:

• Actual dimensions.
• Filter depth.
• Airflow.
• Pressure drop.
• Media construction.
• FCU fan capability.

Camfil FCU Filter Sizes

Camfil's current Fan Coil Filter portfolio includes multiple dimensions for different Fan Coil Units.

Published examples include configurations such as:

Width × Height × Depth	Rated Airflow	Initial Pressure Drop
418 × 170 × 4 mm	495 m³/h	25 Pa
185 × 444 × 4 mm	570 m³/h	25 Pa
212 × 465 × 4 mm	690 m³/h	25 Pa
578 × 170 × 4 mm	700 m³/h	25 Pa
245 × 480 × 4 mm	800 m³/h	25 Pa
578 × 208 × 4 mm	850 m³/h	25 Pa
212 × 665 × 4 mm	990 m³/h	25 Pa
185 × 794 × 4 mm	1,030 m³/h	25 Pa
978 × 170 × 4 mm	1,200 m³/h	25 Pa
978 × 208 × 4 mm	1,500 m³/h	25 Pa

These are examples from Camfil's current published product range and should not be treated as a complete universal FCU size list.

The existing FCU and filter should be measured before ordering.

Why FCU Filters Need Low Pressure Drop

Pressure drop is especially important for Fan Coil Units.

Many FCUs use relatively small fans and have considerably less available static pressure than large AHUs.

If a filter creates excessive resistance, potential consequences can include:

• Reduced airflow.
• Lower cooling capacity.
• Lower heating capacity.
• Increased fan workload.
• Higher noise in some systems.
• Changes in room air circulation.
• Possible coil icing or operational problems under unsuitable conditions.

For this reason, a higher-efficiency filter should not automatically be installed in an FCU without checking fan capability and system airflow.

Camfil FCU Filter Initial Pressure Drop

Camfil currently publishes an initial pressure drop of 25 Pa for its listed Fan Coil Filter configurations at their respective rated airflows.

This relatively low resistance is consistent with the primary purpose of the product: coarse particulate protection of the heating and cooling coil while maintaining airflow through a compact Fan Coil Unit.

Actual system pressure drop will depend on airflow and operating conditions.

Why FCU Coils Need Protection

A cooling or heating coil contains closely spaced surfaces through which air must pass.

Dust accumulation can create an additional layer between the air and heat-transfer surface.

Excessive contamination can potentially:

• Reduce heat-transfer efficiency.
• Increase airflow resistance.
• Increase maintenance requirements.
• Make coil cleaning more difficult.
• Contribute to dirt accumulation inside the FCU.

A suitable FCU Filter helps reduce the amount of larger particulate contamination reaching the coil.

Camfil FCU Filter vs AHU Filter

Parameter	FCU Filter	AHU Filter
Equipment	Fan Coil Unit	Air Handling Unit
Typical Space	Limited	Larger filter section
Fan Static Pressure	Often limited	Typically greater and design-specific
Typical Filter	Thin / Low-resistance filter	Panel, Bag, Compact, HEPA etc.
Primary FCU Function	Protect coil from coarse contamination	Multi-stage air filtration possible
Fine Filtration Capability	Limited by system design	Can support higher efficiencies when engineered accordingly

AHU filtration strategies should therefore not be copied directly into an FCU without checking the FCU's airflow and static-pressure capability.

Camfil FCU Filter vs Panel Filter

Camfil also manufactures conventional Panel Filters for General Ventilation applications.

Panel Filters can serve as prefilters or main filters where installation space is limited.

However, a standard Panel Filter should not automatically replace a dedicated Fan Coil Filter.

Compare:

• Filter depth.
• Dimensions.
• Efficiency.
• Rated airflow.
• Initial pressure drop.
• Available FCU installation space.
• Fan static pressure.

Can Camfil Panel Filters Be Used in FCU Systems?

Potentially, if the FCU is designed to accommodate the selected filter's dimensions and resistance.

Camfil's Panel Filter portfolio includes compact products intended for applications where space is limited, and panel filters can function as prefilters or main filters depending on the product.

However, compatibility should be checked at the individual FCU and filter level.

Can a Pleated Filter Be Installed in an FCU?

A Pleated Filter may be suitable for some FCU designs, but the change should not be based on dimensions alone.

Review:

• Available filter depth.
• Rated airflow.
• Initial pressure drop.
• Fan curve.
• Available external static pressure.
• Required room airflow.

A deeper or more efficient Pleated Filter may create significantly more resistance than the original thin FCU Filter.

Can a Bag Filter Be Installed in an FCU?

Conventional Bag Filters are generally designed for HVAC and AHU systems with sufficient installation space and fan capability.

Most conventional FCUs do not provide the installation depth required for Bag Filters.

Therefore, Camfil Hi-Flo or similar Bag Filters should not automatically be specified for a conventional FCU.

If an unusual FCU or terminal air system is specifically engineered for a Bag Filter, compatibility should be confirmed from the equipment design.

Can Camfil Opakfil Be Installed in an FCU?

Opakfil is a compact V-shaped General Ventilation Filter designed for applications such as second-stage supply-air filtration.

It should not be assumed to be suitable for a conventional FCU because its depth, airflow characteristics and pressure drop may exceed what the Fan Coil Unit can accommodate.

Opakfil is generally more relevant to AHUs and larger ventilation systems.

Can HEPA Filters Be Installed in FCU Systems?

HEPA filtration should not automatically be added to a conventional Fan Coil Unit.

HEPA Filters typically introduce substantially different airflow resistance and sealing requirements compared with a thin coarse FCU Filter.

Before considering HEPA, evaluate:

• Fan static-pressure capability.
• Required airflow.
• HEPA initial and loaded pressure drop.
• Available installation space.
• Filter housing.
• Seal integrity.
• Bypass leakage.
• Required testing.

If HEPA-level room filtration is required, a dedicated terminal HEPA system, FFU or appropriately engineered air-treatment solution may be more suitable than modifying a standard FCU.

Why Higher Efficiency Is Not Always Better for FCU

A common assumption is that installing the highest-efficiency filter will automatically improve the HVAC system.

For FCUs, this approach can be problematic.

A higher-efficiency filter can also have:

• More filtration media.
• Smaller effective pathways through the media.
• Higher pressure drop.
• Greater loaded resistance.

If the FCU fan cannot overcome this resistance, airflow can decrease.

The correct objective is therefore to select a filter that provides the required filtration performance while remaining compatible with the FCU's airflow and fan capability.

Camfil FCU Filters and Indoor Air Quality

FCU filtration can contribute to indoor air cleanliness by capturing particulate contamination in recirculated air.

However, a coarse FCU Filter should primarily be understood as an equipment-protection and coarse-particle filtration stage.

It should not automatically be expected to provide high-efficiency control of:

• PM2.5.
• PM1.
• Ultrafine particles.
• Smoke.
• Viruses.
• VOC gases.
• Odors.

Where higher indoor-air-quality performance is required, the complete building ventilation strategy should be reviewed.

Can Camfil FCU Filters Remove PM2.5?

The current Camfil dedicated Fan Coil Filter is identified as ISO Coarse 50%.

It should therefore not automatically be marketed as a dedicated PM2.5 or PM1 Fine Filter.

If control of PM2.5 or PM1 is required, a suitable ISO 16890 filter should be selected and the ventilation system must have sufficient fan capacity to operate with that filter.

Can Camfil FCU Filters Remove Odors?

Conventional synthetic Fan Coil Filters are particulate filters and are not primarily designed for odor or gaseous contaminant removal.

Odor and VOC control requires appropriate gas-phase filtration media such as selected activated-carbon or specialty molecular media.

Adding such filtration directly to an FCU should only be considered after reviewing airflow, pressure drop, available space and target contaminants.

FCU Filtration and Fresh Air

Many Fan Coil Units primarily recirculate room air.

Fresh outdoor air may be supplied separately by an AHU, FAHU, DOAS or another ventilation system.

In this arrangement, a useful strategy can be:

Fresh-Air System = Higher-Level Outdoor Air Filtration

FCU = Low-Resistance Recirculation / Coil Protection Filter

This division can allow the central ventilation system to handle finer outdoor-air filtration while avoiding unnecessary pressure drop at individual Fan Coil Units.

The actual design depends on the building HVAC configuration.

Camfil FCU Filters for Offices

Office buildings commonly use Fan Coil Units for local temperature control.

FCU Filters can help:

• Protect cooling coils.
• Reduce internal dust accumulation.
• Reduce maintenance requirements.
• Maintain airflow through the terminal unit.

Where higher outdoor-air filtration is required, it may be provided by the central fresh-air system rather than the FCU itself.

Camfil FCU Filters for Hotels

Hotels frequently use Fan Coil Units in individual guest rooms.

Important filter characteristics can include:

• Low pressure drop.
• Compact dimensions.
• Easy replacement.
• Coil protection.
• Compatibility with quiet FCU operation.

Maintenance teams should keep a filter schedule by FCU model or room type where multiple sizes are installed.

Camfil FCU Filters for Apartments

Residential developments can use concealed, ducted or exposed Fan Coil Units.

The filter should match:

• FCU model.
• Filter slot dimensions.
• Airflow.
• Fan capability.
• Maintenance accessibility.

Increasing filter resistance without reviewing the FCU can reduce cooling performance.

Camfil FCU Filters for Hospitals

Fan Coil Units can be used in selected hospital and healthcare areas, depending on the HVAC design and applicable requirements.

The FCU Filter should not automatically be considered the primary infection-control filtration stage.

Where high-efficiency or HEPA filtration is required, the complete ventilation system, pressure relationships, airflow strategy and terminal filtration arrangement should be reviewed.

Camfil FCU Filters for Commercial Buildings

Commercial buildings can contain hundreds or thousands of Fan Coil Units.

For large installations, filter management should include:

• FCU identification number.
• Equipment model.
• Filter dimensions.
• Filter type.
• Quantity.
• Inspection date.
• Replacement history.

A standardized FCU Filter schedule can simplify purchasing and preventive maintenance.

Camfil FCU Filter Selection Guide

1. Identify the FCU Manufacturer and Model

Record the complete Fan Coil Unit manufacturer and model where available.

2. Identify the Existing Filter

Check for Camfil product identification or existing filter documentation.

3. Measure Actual Dimensions

Measure:

Width × Height × Depth

in millimeters.

4. Determine FCU Airflow

Check the FCU technical documentation for nominal airflow at each fan speed where available.

5. Check Pressure Drop

Compare the proposed filter resistance with the available fan static pressure.

6. Determine Required Efficiency

Select an efficiency appropriate to the actual filtration objective.

7. Confirm Installation Method

Check whether the filter:

• Slides into a filter rail.
• Uses a metal frame.
• Uses a removable panel.
• Requires clips or other retainers.

8. Confirm Quantity

For building maintenance, prepare quantities by FCU model and filter size.

Why FCU Filter Dimensions Alone Are Not Enough

Two FCU Filters with identical dimensions can have different:

• Media.
• Efficiency.
• Airflow resistance.
• Dust-holding characteristics.
• Frame construction.

Therefore, replacement selection should include both dimensions and performance characteristics.

Camfil FCU Filter Airflow

Camfil's published Fan Coil Filter range demonstrates why airflow should be considered together with dimensions.

Different filter sizes are listed for different rated airflow values, ranging across the current published range from several hundred to more than 1,500 m³/h.

The correct filter should correspond to the airflow requirement of the Fan Coil Unit.

Camfil FCU Filter Pressure Drop and Fan Performance

The FCU fan must overcome resistance from:

• Air Filter.
• Cooling or heating coil.
• FCU casing.
• Ductwork where present.
• Grilles and diffusers.
• Other system components.

Increasing filter resistance reduces the static-pressure margin available for the remaining system.

This is why pressure drop is one of the most important parameters when selecting an FCU Filter.

Camfil FCU Filter and Cooling Performance

The cooling capacity of an FCU depends partly on sufficient airflow across the coil.

If airflow becomes too low because of an excessively restrictive or heavily loaded filter, cooling performance can be affected.

Keeping the filter and coil in appropriate operating condition can therefore help maintain designed FCU performance.

Camfil FCU Filter Replacement

When replacing an existing Camfil Fan Coil Filter, collect:

• Camfil product identification where available.
• Width.
• Height.
• Depth.
• Existing efficiency.
• FCU manufacturer.
• FCU model.
• Rated airflow.
• Required quantity.

A clear photograph of the existing filter and FCU filter slot can help identify the correct replacement.

Camfil FCU Replacement Filter Schedule

FCU	Equipment Model	Filter Size	Efficiency	Airflow	Quantity
FCU-01	Specify	W × H × D	Specify	m³/h	Specify
FCU-02	Specify	W × H × D	Specify	m³/h	Specify
FCU-03	Specify	W × H × D	Specify	m³/h	Specify

For buildings containing many FCUs, this schedule can significantly simplify replacement planning and inventory control.

When Should Camfil FCU Filters Be Replaced?

There is no single universal replacement interval for every Fan Coil Filter.

Replacement frequency depends on:

• Room dust concentration.
• Operating hours.
• FCU airflow.
• Filter size.
• Occupancy.
• Building environment.
• Fresh-air strategy.
• Filter condition.

Filters should be inspected during routine FCU maintenance and replaced according to actual condition, equipment requirements and facility maintenance procedures.

Signs an FCU Filter May Need Replacement

Possible indicators include:

• Visible heavy dust loading.
• Reduced airflow.
• Increasing FCU noise.
• Reduced cooling or heating performance.
• Contaminated filter media.
• Damaged filter frame.
• Media deterioration.

These indicators should be considered together with the overall condition of the FCU and coil.

Can Camfil FCU Filters Be Washed?

Washability should be confirmed from documentation for the exact filter.

A filter should not automatically be washed simply because it uses synthetic media.

Improper washing can:

• Damage the media structure.
• Change filtration performance.
• Deform the filter.
• Leave contamination in the media.

Only filters specifically designed for cleaning and reuse should be treated as washable.

FCU Coil Cleaning and Filter Maintenance

The Air Filter and coil should be treated as related maintenance components.

A heavily contaminated filter can restrict airflow, while a contaminated coil can also increase resistance and reduce heat-transfer performance.

Routine maintenance can include:

• Inspecting the filter.
• Replacing the filter when required.
• Inspecting the coil surface.
• Cleaning the coil when necessary.
• Inspecting the condensate tray.
• Checking the drain.
• Checking fan condition.
• Confirming airflow after maintenance.

Can Another Brand Replace a Camfil FCU Filter?

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

Compare:

• Actual dimensions.
• Filter depth.
• Efficiency.
• Rated airflow.
• Initial pressure drop.
• Media construction.
• Frame construction.
• FCU compatibility.

Equal dimensions alone do not establish technical equivalence.

Can a Higher Efficiency Filter Replace a Camfil FCU Filter?

Potentially, but the FCU should first be checked for sufficient fan capability.

Before upgrading, verify:

• Existing filter pressure drop.
• New filter pressure drop.
• FCU fan curve.
• Available static pressure.
• Required airflow.
• Cooling and heating capacity requirements.
• Available filter depth.

If the new filter causes excessive resistance, the resulting reduction in airflow may offset the intended benefit of higher filtration efficiency.

Camfil Filters for FCU Systems Price

Camfil FCU Filter prices depend on the exact specification and quantity.

Important quotation parameters include:

• Camfil product or article number where available.
• Width × Height × Depth.
• Efficiency.
• Rated airflow.
• Frame construction.
• Quantity.
• Current availability.
• Delivery requirements.

A generic price should not be used for every FCU Filter because buildings can contain multiple Fan Coil Unit sizes and filter configurations.

Camfil Filters for FCU Systems Quotation

For an accurate quotation, provide:

Parameter	Information Required
Brand	Camfil
Product	Fan Coil Filter / Other compatible Camfil product
Article Number	Provide where available
Dimensions	W × H × D mm
Efficiency	ISO 16890 classification
Rated Airflow	m³/h
Pressure Drop	Pa where available
FCU Brand	Equipment manufacturer
FCU Model	Exact equipment model
Quantity	Required number of filters

Frequently Asked Questions About Camfil Filters for FCU Systems

Does Camfil Manufacture Filters Specifically for Fan Coil Units?

Yes. Camfil currently lists dedicated Fan Coil Filters designed to prevent large dust particles from accumulating on heating and cooling coils.

What Efficiency Is the Camfil Fan Coil Filter?

Camfil's current published Fan Coil Filter range is classified ISO Coarse 50% under ISO 16890 and also shows the former G3 EN 779 reference.

What Media Is Used in Camfil Fan Coil Filters?

Camfil specifies progressively built-up thermally bonded polyester-fibre media for its current Fan Coil Filter range.

What Is the Pressure Drop of a Camfil Fan Coil Filter?

Camfil currently lists 25 Pa initial pressure drop for its published Fan Coil Filter configurations at their specified rated airflow.

How Thick Is a Camfil Fan Coil Filter?

The current Camfil product table lists multiple dedicated Fan Coil Filter configurations at 4 mm depth. The exact replacement specification should still be confirmed before ordering.

Can I Install an ePM1 Filter in an FCU?

Only if the FCU is designed or verified to operate with the resulting filter resistance. Higher-efficiency filtration should not be added without checking fan static pressure and airflow.

Can I Install a HEPA Filter in an FCU?

A conventional FCU should not automatically be upgraded to HEPA. Fan capability, pressure drop, housing, sealing, airflow and testing requirements must first be evaluated.

Can Camfil FCU Filters Remove PM2.5?

The dedicated Camfil Fan Coil Filter is currently classified ISO Coarse 50%, so it should not automatically be represented as a dedicated PM2.5 Fine Filter.

Why Is Low Pressure Drop Important for FCUs?

Fan Coil Units generally have limited fan static pressure. Excessive filter resistance can reduce airflow and potentially affect heating and cooling performance.

How Often Should Camfil FCU Filters Be Replaced?

There is no universal interval. Replacement depends on dust loading, operating hours, room conditions, airflow and the physical condition of the filter.

Can Camfil FCU Filters Be Washed?

Only filters explicitly designed for cleaning and reuse should be washed. Synthetic media alone does not establish that a filter is washable.

How Do I Identify the Correct FCU Replacement Filter?

Provide the existing filter dimensions, FCU manufacturer and model, airflow, efficiency, photographs and Camfil product information where available.

How Can I Get a Camfil FCU Filter Quotation?

Provide the filter size, efficiency, FCU model, airflow and quantity. A photograph of the existing filter and FCU label can help with identification.

Contact VIETPHAT for Camfil Filters for FCU Systems

For consultation or quotation for Camfil Filters for FCU Systems, Fan Coil Filters and replacement FCU filtration, please contact VIETPHAT:

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