FK / FKD Series · Metal Mine Local Ventilation
FK / FKD Metal Mine Local Ventilation Fans
Local ventilation fans for metal mines and other non-coal underground workings. FK configurations serve single-stage and conventional auxiliary ventilation duties, while FKD contra-rotating fans provide higher-pressure performance for longer duct systems and demanding excavation headings.
3,240–64,080 m³/h 475–3,776 Pa FK + FKD
AIRFLOW
3,240–64,080 m³/h
TOTAL PRESSURE
475–3,776 Pa
DUCT DIAMETER
300–800 mm
CONFIGURATION
Single / Contra-Rotating
FK / FKD Series
Technical Index
01 Overview 02 FK vs FKD 03 Performance 04 Duct & Distance 05 Dimensions 06 Applications 07 Selection 08 Replacement 09 Resources 10 FAQ
Quick Facts
Metal / Non-Coal Mines
Local Ventilation
FK Single-Stage
FKD Contra-Rotating
Flexible Duct Supply
Local Ventilation
FK Single-Stage
FKD Contra-Rotating
Flexible Duct Supply
01 / Engineering Overview
Local Air Supply for Underground Metal Mine Workings
FK and FKD fans are used for localized forced ventilation in metal mines and other non-coal underground workings, particularly during development, drifting and single-heading excavation where fresh air must be delivered through ventilation ducting to the working face.
Selection depends strongly on the ventilation-duct diameter, total duct length, leakage, bends and required face airflow. FKD contra-rotating models are suited to operating points requiring more pressure and longer air-delivery distances.
02 / FK vs FKD
Select the Fan Configuration by System Resistance
FK
Single-Stage / Auxiliary
Suitable for conventional local ventilation duties where airflow, duct resistance and supply distance can be satisfied by a single-stage arrangement.
FKD
Contra-Rotating
Two impeller stages rotate in opposite directions to provide a higher-pressure operating range for longer ducts and higher system resistance.
FK / FKD are not the same product family as FB / FBD.
This page is positioned for metal and non-coal mine local ventilation. Coal-mine projects and explosion-protection requirements should be reviewed separately.
03 / Performance Data
FK Series Reference Performance
Airflow is shown in both m³/s and m³/h for easier international project comparison.
MODEL
POWER kW
AIRFLOW m³/s
AIRFLOW m³/h
PRESSURE Pa
DUCT mm
FK58-1 No.3
1.5
0.9–1.4
3,240–5,040
928–575
300
FK58-1 No.3.5
3
1.5–2.4
5,400–8,640
1263–752
350
FK58-1 No.4
5.5
2.2–3.5
7,920–12,600
1648–1020
400
FK58-1 No.4.5
11
3.1–5.0
11,160–18,000
2093–1295
450
FK58-2 No.4
11
2.2–3.5
7,920–12,600
2923–1811
400
FK55-2 No.4.5
11
3.0–5.2
10,800–18,720
2276–1275
450
FK55-1 No.5
11
4.2–6.6
15,120–23,760
1726–1324
450
FK56-1 No.3.15
2.2
1.4–2.1
5,040–7,560
853–588
300
FK56-1 No.4
4
2.1–3.4
7,560–12,240
1275–981
400
FK67-1 No.4.5
7.5
2.6–4.2
9,360–15,120
2256–1177
400
FK67-2 No.4.5
11
2.8–4.3
10,080–15,480
3237–1471
400
FK67-1 No.5.25
28
4.0–6.3
14,400–22,680
3776–2648
500
FK40-1 No.5.5
5.5
4.3–5.1
15,480–18,360
633–475
550
FK40-1 No.6.5
11
7.1–8.4
25,560–30,240
884–663
650
FK40-1 No.7
15
8.8–10.5
31,680–37,800
1025–769
700
FK40-1 No.7.5
22
10.9–12.9
39,240–46,440
1177–883
750
FK40-1 No.8
30
13.2–15.6
47,520–56,160
1339–1005
800
FKD Contra-Rotating Reference Performance
FKD50 uses a contra-rotating two-motor configuration for higher-pressure local ventilation.
MODEL
POWER kW
AIRFLOW m³/s
AIRFLOW m³/h
PRESSURE Pa
DUCT
FKD50 No.5.5
2×5.5
4.8–5.8
17,280–20,880
1182–515
550
FKD50 No.6.5
2×11
7.9–9.5
28,440–34,200
1651–719
650
FKD50 No.7
2×15
9.9–11.9
35,640–42,840
1915–834
700
FKD50 No.7.5
2×22
12.2–14.6
43,920–52,560
2198–957
750
FKD50 No.8
2×30
14.8–17.8
53,280–64,080
2501–1089
800
Reference data should be used for preliminary model screening. Final selection must consider actual duct resistance, leakage, altitude, air density and the required airflow at the working face.
04 / Duct Resistance & Air-Delivery Distance
Fan Pressure Must Match the Entire Ventilation Duct
Duct Diameter
Smaller ducts produce higher resistance at the same airflow.
Duct Length
Longer headings normally require more available fan pressure.
Leakage
Flexible duct joints and damaged sections can reduce airflow delivered to the face.
Bends & Transitions
Elbows, reducers and poor inlet conditions add additional resistance.
05 / Installation Reference
Representative Fan Dimensions
MODEL
DUCT mm
DISTANCE m
OUTER Ø
LENGTH
CENTER H
FK58-1 No.3
300
80
390
486
230
FK58-1 No.4
400
200
520
649
290
FK58-2 No.4
400
400
520
877
290
FK67-1 No.5.25
500
600
620
1364
310
FKD50 No.5.5
550
180
948
3800
337
FKD50 No.8
800
220
1340
4350
485
Dimensions are reference catalog values. Confirm the selected model and final GA drawing before fabrication of supports, duct adapters or installation foundations.
06 / Application Fit
Local Ventilation in Metal and Non-Coal Mines
Development Headings
Deliver fresh air to underground development and drifting faces.
Single-Heading Excavation
Forced ventilation where natural through-flow is unavailable.
Long Duct Runs
FKD contra-rotating configurations for higher-resistance temporary ventilation systems.
Metal & Non-Coal Mines
Local ventilation for underground metal ore and other non-coal mining projects.
07 / Before Selection
Information Required for FK / FKD Selection
01
Required Airflow
Required airflow at the working face.
02
Duct Diameter
Flexible or rigid ventilation duct diameter.
03
Duct Length
Total distance from fan to ventilation face.
04
System Resistance
Known pressure loss or duct layout for engineering review.
05
Mine Type
Metal mine, non-coal mine and underground operating conditions.
06
Electrical Supply
Voltage, frequency, phase and starting method.
07
Hazardous Area
State any gas, dust or explosion-protection requirements separately.
08 / Existing Fan Replacement
JK / DJK Replacement Projects
FK and FKD series may also appear in older project documentation under JK and DJK designations. For replacement work, send the existing fan nameplate, model, motor data, duct diameter and available dimensions.
FK
Commonly cross-referenced with older JK-series local fans.
FKD
Commonly cross-referenced with older DJK contra-rotating local fans.
09 / Technical References
Related Engineering Guides
AIRFLOW & PRESSURE
Industrial Fan Airflow and Pressure Explained → STATIC PRESSURE UNKNOWN
What to Send When Static Pressure Is Unknown → SELECTION
Industrial Fan Selection Center → PRODUCT FAMILY
Mine & Tunnel Ventilation Fans → 10 / FAQ
FK / FKD Mine Ventilation Fan Questions
What is the difference between FK and FKD?
FK covers conventional local ventilation configurations. FKD uses a contra-rotating two-stage arrangement and is generally selected when more pressure is required.
Are FK and FKD intended for coal mines?
This page is positioned for metal and other non-coal mine ventilation. Coal-mine and explosion-protection requirements should be reviewed separately.
What airflow range is available?
The combined reference range shown on this page is approximately 3,240 to 64,080 m³/h.
Can FKD be used for longer ventilation ducts?
FKD provides a higher-pressure contra-rotating configuration, but actual allowable duct length depends on diameter, leakage, bends and the airflow required at the working face.
What information is needed for fan selection?
Provide required face airflow, ventilation-duct diameter and length, system layout, mine conditions, voltage, frequency and installation requirements.
Can you replace an old JK or DJK fan?
Yes, replacement can be reviewed from the old model, nameplate, motor data, performance requirement and installation dimensions.
FK / FKD Local Ventilation Fan Selection
Send the Mine Ventilation Layout and Duct Data.
Required Airflow · Duct Diameter · Duct Length · Resistance · Mine Type · Voltage · Frequency · Quantity
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