Proventofan enclosure filter fans provide filtered, open-loop ventilation for electrical cabinets, control panels and automation enclosures. The FK33 and FK88 ranges cover listed frame sizes from 106.5 to 323 mm, with standard 115VAC, 230VAC and 12–24VDC options, IP54 protection and matching fanless .300 outlet filter units.
Projects may also specify the same product as an electrical cabinet filter fan or control panel fan filter.
We mold the FK33 and FK88 filter frames in our own injection molding shop, not through an outsourced supplier. The same tooling and the same production line produce both the sample you test and the units in a bulk order, so the frame fit, cutout tolerance and panel-latch mechanism you evaluate on a sample do not shift when the order moves to volume production.
FK33IP54 · CE
FK33 Enclosure Filter Fan Front View
Front-panel design
FK33 grille and front-panel construction
Filter-mat access
Access according to the applicable FK33 housing
Buying consideration
Use when the required dimensions and listed model data fit the project
FK33 and FK88 are two front-panel constructions within the same enclosure filter fan category. Selection should be based on the required size, voltage, airflow and maintenance access. It should not be based on an unsupported claim that one family is universally higher-performing.
Both series include multiple sizes and standard voltage choices. Specific airflow, current, power and noise must be read from the selected model row. Do not infer that FK88 has more airflow, a higher IP rating, lower noise or longer life solely from the front-panel design.
Compare series construction, variants and maintenance access
How to compare the two series
Confirm the frame or cutout size and voltage before comparing model rows against the airflow duty. Use published with-filter figures where available. After those requirements are met, compare front-panel construction and maintenance access.
FK33 includes selected -B alternative-grille variants and selected -D larger-fan variants. FK88 has selected -D variants but no listed -B range. These suffixes are model-specific; they are not evidence that every size exists in every construction. The complete table remains the authority for availability and data.
For maintenance planning, consider how often technicians can reach the front of the installed cabinet and whether filter checks are part of routine service. FK88's opening panel can make that task more convenient, while FK33 remains a valid choice wherever its construction, dimensions and published specifications meet the project.
03 / Specifications
Size, Voltage and Airflow Specifications
FK3320 Filter Fan Dimensions and Cutout
Model suffix guide
Suffix
Meaning
.230
230VAC
.115
115VAC
.024
12/24VDC
.300
Fanless outlet filter unit; no fan and no airflow rating
-D
Selected listed larger-fan/higher-airflow variant
-B
Selected FK33 alternative-grille variant; not listed for FK88
FK3325 standard is 208 mm. FK3325-B/FK3325-D and FK8825/FK8825-D are 255 mm. Do not treat -B as a name-only change or invent corresponding FK88 -B rows.
Quick size reference
Frame size
FK33 starting family
FK88 starting family
Listed standard AC max free air
Listed -D max free air
Notes
106.5 mm
FK3320
Not listed
26 m³/h
Not listed
FK3320.230: 82 × 82 mm cutout
116.5 mm
FK3321
FK8821
25 m³/h
Not listed
Compact cabinet direction
148.5 mm
FK3322
FK8822
66 m³/h
Not listed
Small/medium panel direction
204 mm
FK3323
FK8823
120 m³/h
FK33 205 / FK88 163 m³/h
Selected -B and -D variants
208 mm
FK3325
Not listed
240 m³/h
Not listed
FK33 standard housing only
255 mm
FK3325-B
FK8825
265 m³/h
FK33 380 / FK88 500 m³/h
Selected -B/-D variants
323 mm
FK3326
FK8826
560 m³/h
1,350 m³/h
Large-frame direction
Free-air values are not installed-airflow guarantees. Review the complete Airflow with filter column where available and confirm system resistance. A blank value is unknown, not zero and not permission to copy a related AC value into a DC row.
An IP54 filter fan description applies to the listed assembly rating; it does not upgrade the completed cabinet to NEMA 4/4X. Buyers searching for a 250mm fan filter should specify the actual 255 mm family and cutout in the RFQ. The table also retains the 208 mm FK3325 standard size so those two product points are not merged.
Publication note: / separates listed 50/60 Hz values where supplied. Not published means the source does not provide a verified public value; it is not zero. Free-air figures must not be represented as installed airflow. Confirm the operating point against filter and system resistance.
Data note: “Not published” means no verified public value is available. Do not infer missing DC, with-filter, current, power or noise data from another model row.
Model
Voltage
Airflow free
Airflow with filter
Current
Power
Noise
FK3320.230
230VAC
22/26 m³/h
Not published
Not published
Not published
Not published
FK3321.230
230V 50/60Hz
20/25 m³/h
1×3321: 15/18 m³/h
0.07/0.06A
11/13W
36/38dB
FK3321.115
115V 50/60Hz
20/25 m³/h
1×3321: 15/18 m³/h
0.12/0.1A
11/13W
36/38dB
FK3321.024
12/24VDC
70 m³/h
Not published
0.18A
2.65W
36/38dB
FK3322.230
230V 50/60Hz
55/66 m³/h
1×: 43/50 m³/h / 2×: 48/58 m³/h
0.12/0.1A
19/14W
50/52dB
FK3322.115
115V 50/60Hz
55/66 m³/h
1×: 43/50 m³/h / 2×: 48/58 m³/h
0.24/0.2A
18/15W
50/52dB
FK3322.024
12/24VDC
113 m³/h
Not published
0.3A
3.5W
50/52dB
FK3323.230
230V 50/60Hz
105/120 m³/h
1×3323: 78/90 m³/h
0.12/0.1A
19/14W
50/52dB
FK3323.115
115V 50/60Hz
105/120 m³/h
1×3323: 78/90 m³/h
0.24/0.2A
18/15W
50/52dB
FK3323.024
12/24VDC
126 m³/h
Not published
0.3A
3.5W
50/52dB
FK3323.230-B
230V
105/120 m³/h
1×3323: 78/90 m³/h
0.12/0.1A
19/14W
50/52dB
FK3323.115-B
115V
105/120 m³/h
Not published
0.24/0.2A
18/15W
50/52dB
FK3323.024-B
12/24VDC
126 m³/h
Not published
0.3A
3.5W
Not published
FK3323.230-D
230V
175/205 m³/h
Not published
0.25A
32/30W
56dB
FK3323.115-D
115V
175/205 m³/h
Not published
0.45A
32/30W
56dB
FK3323.024-D
12/24VDC
Not published
Not published
Not published
Not published
Not published
FK3325.230
230V 50/60Hz
220/240 m³/h
1×3325: 155/185 m³/h
0.24/0.22A
38/36W
50/52dB
FK3325.115
115V 50/60Hz
220/240 m³/h
1×3325: 155/185 m³/h
0.48/0.46A
38/36W
50/52dB
FK3325.024
12/24VDC
Not published
Not published
0.58A
14W
50/52dB
FK3325.230-B
230V
230/265 m³/h
1×: 170/205 m³/h / 2×: 200/230 m³/h
0.26/0.2A
37/33W
48/52dB
FK3325.115-B
115V
230/265 m³/h
Not published
0.51/0.42A
40/35W
48/52dB
FK3325.024-B
12/24VDC
Not published
Not published
0.46A
14W
Not published
FK3325.230-D
230V
355/380 m³/h
Not published
0.45A
52/48W
64dB
FK3325.115-D
115V
355/380 m³/h
Not published
0.9A
52/48W
64dB
FK3325.024-D
12/24VDC
Not published
Not published
Not published
Not published
Not published
FK3326.230
230V 50/60Hz
500/560 m³/h
1×: 360/390 m³/h / 2×: 440/495 m³/h
0.29/0.33A
65/77W
62/64dB
FK3326.115
115V 50/60Hz
500/560 m³/h
Not published
0.61/0.63A
61/71W
62/64dB
FK3326.024
12/24VDC
Not published
Not published
Not published
Not published
Not published
FK3326.230-D
230V
1200/1350 m³/h
Not published
0.47/0.59A
104/135W
68/70dB
FK3326.115-D
115V
1200/1350 m³/h
Not published
1.1/1.2A
110/136W
68/70dB
FK3326.024-D
12/24VDC
1282.5 m³/h
Not published
Not published
Not published
Not published
Model
Voltage
Airflow free
Airflow with filter
Current
Power
Noise
FK8821.230
230V 50/60Hz
20/25 m³/h
1×8821: 15/18 m³/h
0.07/0.06A
11/13W
38/43dB
FK8821.115
115V 50/60Hz
20/25 m³/h
Not published
0.12/0.1A
11/13W
38/43dB
FK8821.024
12/24VDC
70 m³/h
Not published
0.18A
2.65W
Not published
FK8822.230
230V 50/60Hz
55/66 m³/h
1×8822: 43/50 m³/h
0.12/0.1A
19/14W
50/52dB
FK8822.115
115V 50/60Hz
55/66 m³/h
Not published
0.24/0.2A
18/15W
50/52dB
FK8822.024
12/24VDC
113 m³/h
Not published
0.3A
3.5W
Not published
FK8823.230
230V 50/60Hz
105/120 m³/h
1×8823: 71/82 m³/h
0.12/0.1A
19/14W
50/52dB
FK8823.115
115V 50/60Hz
105/120 m³/h
Not published
0.24/0.2A
18/15W
50/52dB
FK8823.024
12/24VDC
126 m³/h
Not published
0.3A
3.5W
Not published
FK8823.230-D
230V
138/163 m³/h
1×8823: 95/120 m³/h
0.24/0.22A
34/32W
50/52dB
FK8823.115-D
115V
138/163 m³/h
Not published
Not published
Not published
Not published
FK8823.024-D
12/24VDC
Not published
Not published
Not published
Not published
Not published
FK8825.230
230V 50/60Hz
230/265 m³/h
Not published
0.26/0.2A
37/33W
48/52dB
FK8825.115
115V 50/60Hz
230/265 m³/h
Not published
0.51/0.42A
40/35W
48/52dB
FK8825.024
12/24VDC
Not published
Not published
0.46A
14W
Not published
FK8825.230-D
230V
485/500 m³/h
Not published
0.36/0.4A
50/48W
63/67dB
FK8825.115-D
115V
485/500 m³/h
Not published
Not published
Not published
Not published
FK8825.024-D
12/24VDC
Not published
Not published
Not published
Not published
Not published
FK8826.230
230V 50/60Hz
500/560 m³/h
1×8826: 360/390 m³/h
0.29/0.33A
65/77W
62/64dB
FK8826.115
115V 50/60Hz
500/560 m³/h
Not published
0.61/0.63A
61/71W
62/64dB
FK8826.024
12/24VDC
Not published
Not published
Not published
Not published
Not published
FK8826.230-D
230V
1200/1350 m³/h
1×: 769/890 m³/h / 2×: 910/1000 m³/h
0.47/0.59A
104/135W
68/70dB
FK8826.115-D
115V
1200/1350 m³/h
Not published
1.1/1.2A
110/136W
68/70dB
FK8826.024-D
12/24VDC
Not published
Not published
Not published
Not published
Not published
FK .300 Fanless Outlet Filter UnitFilter Fan and .300 Outlet Unit Pair
04 / Airflow path
Intake Fan and .300 Outlet Filter Unit Pairing
A .300 model is a fanless outlet filter unit. It provides a filtered discharge opening and does not contain a motor.
01
Match the family
Use the corresponding base family and panel size for the powered unit and outlet.
02
Confirm both openings
Approve the intake and outlet cutouts before the panel drawing is released.
03
Quote both quantities
List powered units, .300 outlets and spare filter mats as separate RFQ lines.
.300 is fanless. If powered exhaust is required, state that requirement separately.
The examples below are starting points for comparison, not automatic model recommendations. Confirm airflow, cutout, voltage, filter resistance and environment before ordering. They cover the search language buyers use, including cabinet filter fan, cabinet fan filter, control panel fan filter and electrical panel fan filter. Those phrases do not describe four different product types.
Filter Fan Installed on a Control PanelFilter Fan for an Industrial Electrical Cabinet
Compact electrical boxes
FK3320 and FK3321 are starting sizes for compact enclosures.
Application notes
FK3320 and FK3321 are starting sizes for compact enclosures. FK3320.230 has a listed 106.5 × 106.5 × 52 mm outer size, 82 × 82 mm cutout and 22/26 m³/h airflow. Send the actual panel opening; the product face alone is not enough for selection.
Small enclosures can still have concentrated heat sources and restricted internal passages. Check the heat-load distribution, wire ducts and clearance behind the panel before assuming that the smallest frame is sufficient. A compact frame is useful only when its verified airflow and cutout fit the enclosure.
PLC and automation control panels
PLC cabinets may contain power supplies, contactors, relays and I/O hardware with changing loads.
Application notes
PLC cabinets may contain power supplies, contactors, relays and I/O hardware with changing loads. FK3321, FK3322 and FK3323 are common size families to compare after the duty point is known. For diagnosis beyond product selection, read about PLC cabinet overheating.
For an automation buyer, a PLC cabinet cooling fan filter or control panel fan filter must also fit the panel layout and maintenance plan. Share a drawing if cable ducts, HMIs or door hardware limit the mounting area. Cabinet width alone does not define the available cutout.
VFD and inverter cabinets
VFD and inverter loads can require greater attention to heat generation and airflow layout.
Application notes
VFD and inverter loads can require greater attention to heat generation and airflow layout. Mid-size FK3323/FK3325 families may be compared, but the correct cooling method and airflow must be calculated for the project. See VFD enclosure cooling and inverter cabinet cooling fans.
Telecom and 5G cabinets
Telecom cabinets may call for 12–24VDC models, but outdoor exposure cannot be approved from voltage and IP54 alone.
Application notes
Telecom cabinets may call for 12–24VDC models, but outdoor exposure cannot be approved from voltage and IP54 alone. Confirm rain, dust, corrosion, solar load and sealing requirements. See telecom cabinet cooling solutions.
Outdoor and industrial electrical cabinets
A larger electrical enclosure filter fan such as an FK3326/FK8826 family may be considered when the duty and panel size justify it.
Application notes
A larger electrical enclosure filter fan such as an FK3326/FK8826 family may be considered when the duty and panel size justify it. IP54 does not mean that every roadside, rooftop, washdown, oily or corrosive location is acceptable. A sealed or closed-loop method may be required.
The phrase industrial filter fans covers widely different sites. State whether the cabinet is indoors or outdoors and describe dust, moisture, oil mist, chemicals and cleaning practices. That environment description is as important as the nominal airflow when deciding whether open-loop filtration is acceptable.
Higher-airflow or maintenance-sensitive projects
Selected -D variants use a larger fan for higher listed free-air performance.
Application notes
Selected -D variants use a larger fan for higher listed free-air performance. Projects that prioritize front filter access can compare FK88 construction. In both cases, use the published model data and request engineering review where with-filter or DC data is not published.
06 / Buying checks
What Buyers Need to Confirm Before Ordering
An enclosure filter fan is not selected by the visible grille size alone. The following checks prevent avoidable panel rework, incomplete airflow paths and quotation delays.
Confirm the Mounting Cutout
Send the actual mounting cutout, not only the visible frame size.
Details
The product face, internal fan and panel opening are different dimensions. Before cutting sheet metal or approving a batch, confirm the actual mounting cutout. For example, FK3320.230 has a listed outer size of 106.5 × 106.5 × 52 mm and an 82 × 82 mm cutout. A project that sends only a fan size or front-panel measurement may still be missing the dimension needed for installation.
Plan the Air Outlet
Quote the powered intake and matching fanless outlet together.
Details
A powered intake unit needs a clear outlet path. Each listed size can be paired with a same-size .300 fanless outlet filter unit. Confirming the powered unit and outlet together reduces the risk of a second purchase order or a late panel change.
Define Required Airflow
Use the required duty point, not only a free-air catalog value.
Details
Required airflow depends on the heat load, permissible temperature rise and the actual air path. Published free-air values are not the same as installed airflow through a filter and cabinet. If no duty point is available, use the enclosure airflow calculator; if one is available, use it as a preliminary input for the selector and then confirm the system resistance.
Complete the RFQ Details
Add quantity, destination, delivery timing and customization.
Details
A usable quotation needs more than a model. Include quantity, sample or bulk requirement, destination, desired delivery date and customization. MOQ starts from 10 pieces depending on model and customization. Samples are available and usually require 2–3 days for preparation. Standard lead time is generally 3–10 days subject to model, quantity and stock status; OEM or custom orders are typically 5–15 days depending on the work required.
For freight planning, the quotation can include carton count, gross and net weight, carton dimensions and packed-cargo photos. Packing figures on this page are carton-level references, not fixed container-loading promises.
An enclosure filter fan is a panel-mounted fan and filter assembly used to move ambient air through an electrical enclosure. Filter fans for enclosures support open-loop cooling by admitting filtered air through one side of a cabinet and allowing warm air to leave through a controlled outlet. The terms enclosure fan filter and filter fan are often used for the same industrial product category.
Terminology, scope and RFQ definitions
Term
Meaning on this page
Included here?
Enclosure filter fan
Powered, filtered ventilation unit for a cabinet or control panel
Yes
Fan filter
Common wording that may also describe unrelated consumer filters
Only when the industrial context is clear
Filter fan mat
Replaceable filter medium used in the assembly
As a replacement/maintenance item
Fan filter unit / FFU
Usually a cleanroom ceiling air unit in search results
No
This page does not cover HEPA cleanroom FFUs, charcoal filters, ceiling-fan filters or DIY box-fan products.
The assembly normally combines a powered axial fan, protective grille, replaceable filter mat and panel-mounting frame. The filter reduces the entry of larger airborne contamination while the fan maintains forced ventilation. It does not make an enclosure airtight or eliminate the need to assess heat load, air resistance and environmental exposure.
Terminology matters during an RFQ. “Fan size” may refer to the internal axial fan, visible frame or cutout, so send a drawing or measured opening. “Airflow” should state whether it is a required duty point, free-air catalog figure or value measured with the filter fitted. These distinctions let purchasing and engineering discuss the same product without relying on an ambiguous category name.
08 / Cooling method
When a Filter Fan Is the Right Cooling Method
A filter fan may fit when
A filter fan is a practical starting point when the enclosure can be cooled with ambient air, the surrounding air is acceptable after filtration and the equipment permits open-loop ventilation. Typical applications include control panels, PLC cabinets and other enclosures where heat must be carried out continuously without a closed refrigeration circuit.
Review another method when
A filter fan may not be suitable when ambient temperature is above the target internal temperature, the cabinet must remain sealed, or the environment contains heavy dust, conductive particles, oil mist, corrosive vapor or direct weather exposure beyond the verified protection boundary. IP54 does not automatically equal NEMA 4 or NEMA 4X.
Bigger is not automatically better. A large free-air number cannot compensate for the wrong cutout, an undersized outlet, an obstructed flow path or a loaded filter mat. Start with the cooling method and duty point, then confirm cutout, voltage and system resistance.
Before choosing open-loop ventilation, compare the hottest expected ambient condition with the maximum acceptable cabinet temperature. Confirm that the incoming air will not introduce contamination that the filter and enclosure cannot manage. Also check that internal devices do not block the path between intake and outlet. These are method-level checks; they do not require turning this product page into a full thermal-design guide.
When the ambient conditions and temperature relationship are acceptable, a filter fan can provide the required open-loop airflow. If either condition fails, a higher nominal airflow may introduce unsuitable air or still miss the target temperature. Review a heat exchanger, enclosure air conditioner or another closed-loop method before requesting a filter-fan model.
09 / Engineering note
Confirm These 4 Inputs Before Model Selection
Start with the panel opening, electrical supply, airflow duty and complete cabinet air path. This avoids model-name guessing and late panel rework.
01
Mounting cutout
Send the available panel opening or a dimension drawing.
02
Supply voltage
Use listed 115VAC, 230VAC or 12–24VDC; 380V and 48V remain on request.
03
Required airflow
Send the duty point, or calculate it from heat load and temperature inputs.
04
Complete air path
Confirm the powered intake and matching fanless outlet arrangement.
Tool results are preliminary. Final confirmation must consider the actual filter and system resistance.
10 / Maintenance
Filter Mat Replacement and Maintenance
A filter mat protects the enclosure airflow path, but dust loading also adds resistance and reduces delivered airflow. Set the inspection interval from the actual site conditions; one interval will not fit every installation. A clean indoor panel and a dusty industrial cabinet will not load the filter at the same rate.
Filter inspection, replacement and spare-mat notes
FK88 uses a latch/button front panel that can be opened for easier access to the filter mat. Replacement mats can be quoted separately by FK model. When planning the first order, identify the operating environment and ask whether spare mats should ship with the powered units. Availability and quantity must be confirmed with the quotation; this page does not imply permanent stock.
What to check during maintenance
Inspect the fan filter mat for visible loading, damage and poor seating. Also check whether airflow openings are blocked, whether warm air is recirculating toward the intake and whether the outlet mat is loading at a different rate. Replace a damaged or heavily loaded mat; do not try to recover performance from an obstructed airflow path.
Use the exact FK model when requesting a replacement. Frame size alone may not identify every housing or mat requirement. If an order covers several enclosure types, list the model and spare quantity for each one so that powered units, .300 outlets and replacement mats remain traceable during maintenance.
Removing the FK88 Filter MatEnclosure Filter Fan Replacement Mat
11 / Documentation
Certification, IP54 Protection and QC Support
Certification documents
CE documents are available with an inquiry. ISO quality-management documentation can be confirmed during quotation. Until formal files are supplied for publication, this page will not show certificate numbers, declaration-of-conformity links or certificate images.
IP54 boundary
All listed FK33/FK88 filter fan models are described as IP54. IP54 must not be represented as NEMA 4 or NEMA 4X, and it does not by itself approve a cabinet for direct weather, washdown, oil mist or corrosive exposure.
Materials and operating conditions
The listed frame material is ABS. Standard colors are RAL7035 and RAL7032; other colors are available on request. The confirmed operating-temperature range is -10°C to +55°C.
Documents and pre-shipment confirmation
Depending on the inquiry, support can include a datasheet, dimension drawing, CE documentation, ISO-related documentation, packing information and model/voltage confirmation. Before shipment, the order can be checked for model, voltage, quantity, carton count, gross/net weight, carton dimensions and packed-cargo photos.
Document-control and pre-shipment detail
No unverified certificate number, AQL level, test result or customer approval will be added to this page.
For document-controlled projects, list the exact files required with the RFQ so their availability can be checked before order confirmation. A general CE statement does not replace a customer-specific document list, and an IP rating does not replace review of the completed enclosure.
QC support should be described through records that can actually be supplied for the order: model and voltage confirmation, dimensions, packing details and agreed document copies. Do not turn a general pre-shipment check into an invented test protocol. Any special inspection, sampling level or customer witness point must be agreed in the quotation before it appears as a commitment.
FK Series Filter Fan Injection Molding Machine
The FK33 and FK88 filter frames shown throughout this page are produced on our own injection molding line, from raw material through to the finished part.
FK Series Filter Fan Frame Injection Molding ProcessWorker Operating the Filter Fan Injection Molding MachineFilter Fan Frame Injection Molding Close-UpFK33 and FK88 Enclosure Filter Fan Finished Product
12 / Purchasing
Reference Price Range and Packing Data
The following ranges are published for preliminary budgeting in USD per piece. They are not a standing offer or a quantity-independent price list. Final quotation depends on model, voltage, quantity, customization and shipping terms.
Model
Reference price range, USD/pc
FK3320.230
5.06–6.18
FK3321.230
5.24–6.40
FK3322.230
6.20–7.58
FK3323.230
7.80–9.53
FK3325.230
12.28–15.01
FK3326.230
30.32–37.06
FK3320.300
1.38–1.68
FK3321.300
1.50–1.83
FK3322.300
1.69–2.07
FK3323.300
2.13–2.60
FK3325.300
3.82–4.67
FK3326.300
4.76–5.82
.300 rows are fanless outlet filter units. They must not be compared as powered fan prices.
The table does not assign a fixed MOQ tier to each range. Use it to compare approximate budget levels across the listed 230VAC powered models and corresponding outlet units; request a final quotation for the actual quantity and model mix. Custom voltage, color, documentation or packing requirements may change the quoted amount and lead time.
Model
Pcs/ctn
G.W. kg
N.W. kg
Carton size, cm
CBM/ctn
FK3320.230
60
20.4
18.4
52 × 27 × 31
0.0435
FK3321.230
60
21.4
19.4
52 × 27 × 31
0.0435
FK3322.230
30
21.1
19.1
48 × 34 × 39
0.0636
FK3323.230
20
17.6
15.6
44 × 47 × 56
0.1158
FK3325.230
12
18.4
17.4
56 × 40 × 56
0.1254
FK3326.230
6
24.4
22.4
70 × 36 × 53
0.1336
FK3320.300
120
19.0
17.0
51 × 27 × 32
0.0441
FK3321.300
120
20.0
18.0
51 × 27 × 32
0.0441
FK3322.300
60
20.0
18.0
48 × 34 × 39
0.0636
FK3323.300
40
12.7
10.7
46 × 40 × 37
0.0681
FK3325.300
40
14.4
12.4
56 × 40 × 56
0.1254
FK3326.300
24
16.4
14.4
70 × 35 × 36.5
0.0894
Freight-estimate formulas
Cartons needed = ceiling(order quantity ÷ pieces per carton)
Estimated CBM = cartons needed × CBM per carton
These formulas estimate carton volume only. They do not state fixed 20GP, 40GP or 40HQ loading quantities. Final loading depends on mixed models, pallets, stacking, weight limits and the freight forwarder's plan.
For a budgeting example, 100 pieces of FK3323.230 at 20 pieces per carton require 5 cartons. Using the listed 0.1158 CBM per carton gives an estimated carton volume of 0.579 CBM. The listed carton gross weight gives 88 kg before any pallet or additional export packing. This is arithmetic from the current carton table, not a freight quote or guaranteed loading plan.
Payment terms can be confirmed with the quotation. Shipping terms and the applicable FOB port can be confirmed with the quotation.
When requesting a freight estimate, state whether models will be mixed and whether pallets are required. The carton table can estimate volume for one listed item, but final shipment planning must account for the actual model mix, carton rounding and forwarder requirements. A final PI or shipping file should therefore supersede the budgeting calculation shown here.
13 / Quote preparation
Quick Matching Checklist for a Filter Fan Quote
Choose the path that matches the information already available. The tools provide preliminary results; engineering or sales confirms the final model.
01
Airflow unknown
Use heat load and temperature inputs to estimate the required duty point.
Final confirmation considers the submitted duty point, filter and system resistance, voltage data and available catalog information. Add color, destination, delivery date and drawing upload in the RFQ form when applicable.
Proventofan manufactures FK33 and FK88 enclosure filter fans for standard orders, samples and project-based customization. Standard catalog orders have a MOQ starting from 10 pieces; OEM custom-specification and private-label orders have a MOQ of 50 pieces. Standard lead time is usually 3–10 days subject to model, quantity and stock status. OEM/custom orders take 5–15 days depending on the requested changes.
OEM scope, samples and custom-voltage notes
When comparing an enclosure filter fan manufacturer or filter fan supplier, check whether the quotation connects product data with order details. Use the same model reference for samples, bulk orders, outlet units, replacement mats, carton information and customization.
Samples are available, and sample preparation usually takes 2–3 days. Standard colors are RAL7035 and RAL7032; custom colors are available on request. A one-year warranty applies under the confirmed quotation and order terms.
OEM scope must be defined before lead time is confirmed. State whether the request changes only color/labeling or also voltage, fan configuration, packaging or documentation. A sample approval does not authorize unlisted performance claims, and production specifications should remain tied to the reviewed model and drawing.
Listed standard voltage options are 115VAC, 230VAC and 12–24VDC. Custom 380V and 48V options can be discussed on request after the model, airflow target, quantity and electrical requirements are confirmed. No unpublished current, power, noise or airflow value is implied for those custom options.
RFQ checklist
Send the mounting cutout, voltage, required airflow, quantity, application environment, .300 outlet requirement, color, custom voltage and target delivery date. Include a cabinet drawing when possible.
Payment terms can be confirmed with the quotation. Shipping terms and the applicable FOB port can be confirmed with the quotation.
An enclosure filter fan is a panel-mounted fan and filter assembly that moves ambient air through an electrical cabinet. Filter fans for enclosures support open-loop ventilation: the powered unit moves filtered air, while a controlled outlet allows heated air to leave. They are not cleanroom fan filter units or sealed-cabinet cooling systems.
What is the difference between a filter fan and a fan filter?
In an electrical-cabinet context, both terms may describe the same filtered ventilation product. However, “fan filter” search results also include consumer filters and cleanroom equipment. This page uses “enclosure filter fan” to identify the industrial panel-mounted powered assembly clearly.
What is the difference between FK33 and FK88 filter fans?
FK33 and FK88 use different front-panel constructions. FK88 has latch/button access that allows the front panel to open for more convenient filter-mat replacement. This structural difference does not by itself mean that FK88 has higher airflow, lower noise, longer life or a higher IP rating; compare the selected model data.
When should I use a filter fan for an electrical enclosure?
Use a filter fan when ambient air can remove the heat, the environment is acceptable after filtration and open-loop ventilation is permitted. Consider another cooling method when the enclosure must remain sealed, ambient temperature exceeds the target internal temperature, or dust, oil, corrosion or weather exposure exceeds the verified boundary.
What size filter fan do I need for an electrical cabinet?
Start with required airflow, mounting cutout, voltage and the resistance of the filter and cabinet path. Do not select only from the visible frame size or free-air number. Calculate a preliminary airflow duty in CCT1, screen candidates in CCT2 and request human review before cutting the panel or ordering a batch.
What cutout size should I send for a filter fan quote?
Send the actual panel opening or mounting cutout, not only the front-frame or internal fan size. For example, FK3320.230 has a 106.5 × 106.5 × 52 mm outer size and an 82 × 82 mm cutout. A drawing is preferred when the panel has limited clearance.
Should the filter fan be used for intake or exhaust?
A common arrangement uses the powered filter fan as a lower intake and a fanless outlet filter at the opposite upper side. The final position depends on heat sources, obstructions and recirculation risk. Review the enclosure fan filter placement guide before fixing the cutouts.
What is a .300 outlet filter unit?
A .300 unit is a fanless outlet filter containing the matching housing, grille and filter mat without a powered fan. It is installed on the cabinet outlet side and paired by size with the powered intake unit. It must not be described or priced as an exhaust fan.
How often should a fan filter mat be replaced, and can replacements be ordered separately?
Inspect and replace the mat according to actual dust loading and airflow condition; there is no universal interval for every cabinet. Replacement mats can be quoted separately by FK model. FK88's opening front panel provides more convenient access where regular maintenance is a priority.
Can an IP54 filter fan be used outdoors or in a NEMA 4/4X enclosure?
IP54 alone does not confirm suitability for every outdoor location and is not equivalent to NEMA 4 or NEMA 4X. Rain, washdown, conductive dust, oil mist, corrosion, solar load and the completed enclosure design must be reviewed. A sealed or closed-loop cooling method may be required.
Are 115V, 230V and DC filter fans available?
Yes. Listed standard options include 115VAC, 230VAC and 12–24VDC, subject to the selected model row. Custom 380V and 48V options remain available on request; their performance and electrical data must be confirmed for the project and are not inferred from standard models.
Do you supply OEM or custom filter fans?
Yes. Standard catalog orders have a MOQ starting from 10 pieces; OEM custom-specification and private-label orders have a MOQ of 50 pieces. Standard lead time is usually 3–10 days, while OEM/custom work generally takes 5–15 days depending on details. Samples are available and usually take 2–3 days to prepare. Custom colors and voltages require quotation review.
Do you provide filter fan price ranges and packing data?
Yes. This page publishes reference price ranges and carton-level packing for listed FK33 powered units and matching .300 outlet units. Prices are for budgeting, not fixed offers. Container quantities are not claimed; use pieces per carton and CBM per carton for a preliminary freight estimate.
What information should I send for a filter fan quote?
Send the mounting cutout, voltage, required airflow, quantity, cabinet application, ambient conditions and whether a matching .300 outlet unit is needed. Add color, custom voltage, sample/bulk requirement, destination and target delivery date. Payment and applicable FOB terms are confirmed with the quotation.
Choose the next page by task. Start with the main guide for a cooling-method decision. Use the calculation article or CCT1 for a required airflow, and use CCT2 when airflow, voltage or cutout is already known. The placement and NEMA/IP guides cover installation and rating questions in greater depth.
For an existing cabinet, gather the cutout, voltage and current model before opening the selection guide. For a new cabinet, calculate the airflow first and then compare candidate frame sizes. If the site requires a sealed enclosure or a rating beyond IP54, review the method and rating guides before requesting an FK33 or FK88 quotation.
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