FK / FKD Metal Mine Local Ventilation Fans
Local forced ventilation for metal mines and other non-coal underground workings. FK covers single-stage duties; FKD uses a contra-rotating, two-motor configuration for higher-resistance and longer duct systems.
Select against required face airflow, duct diameter and length, system resistance, mine conditions and electrical supply.
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, including development, drifting and single-heading excavation where fresh air must be delivered through ventilation ducting to the working face.
The source recommends considering duct diameter, total duct length, leakage, bends and required face airflow. FKD contra-rotating models serve operating points requiring more pressure and longer air-delivery distances.
Choose FK or FKD by System Resistance
Suitable where one stage can satisfy airflow, duct resistance and delivery distance.
Two impeller stages rotate in opposite directions for a higher-pressure operating range on longer or higher-resistance ducts.
FKD50 is listed with two motors. Confirm the project model, motor arrangement and duty point before substitution or replacement.
FK Single-Stage Series
Airflow is shown in m³/s and m³/h as on the source page. Pressure ranges below retain the source’s value order. Use these as preliminary references; actual airflow at the working face depends on duct resistance, leakage, altitude and air density.
| 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 Series
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 (mm) |
|---|---|---|---|---|---|
| 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 |
Representative Fan Dimensions
These are source catalog reference values. Confirm the selected model and final GA drawing before fabricating supports, duct adapters or foundations.
| Model | Duct (mm) | Distance (m) | Outer Ø (mm) | Length (mm) | Center H (mm) |
|---|---|---|---|---|---|
| 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 |
Local Ventilation in Metal and Non-Coal Mines
Deliver fresh air to underground development and drifting faces.
Forced ventilation where natural through-flow is unavailable.
FKD contra-rotating configurations for higher-resistance temporary systems.
Local ventilation for underground metal ore and other non-coal mining projects.
What to Send for FK / FKD Selection
Required volume at the working area.
Flexible or rigid duct diameter and total fan-to-face distance.
Known pressure loss, layout, bends and leakage condition.
Mine type, gas/dust hazards, voltage, frequency, phase and starting method.
For replacement projects, include the old model, nameplate, motor data, duct diameter and available installation dimensions. FK and FKD may appear in older project records alongside JK and DJK designations; verify the actual duty and interfaces before replacement.
FK / FKD Mine Ventilation Questions
What is the difference between FK and FKD?
FK covers single-stage local ventilation. FKD uses a contra-rotating two-stage arrangement with two motors in the listed FKD50 data.
Are FK / FKD coal-mine fans?
This source page positions FK / FKD for metal and other non-coal underground mine duties. Coal-mine and explosion-protection requirements need separate review.
Can an FK or FKD replace an older JK or DJK fan?
Replacement can be reviewed from the existing model and nameplate, duty point, motor data, duct diameter and installation dimensions. Do not substitute on model name alone.