Mine Auxiliary Fans

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Powering Ventilation, Driving Progress — Mining ventilation fans, mine fans & mining blowers for underground mines, tunnel ventilation, and industrial sites.

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+86 15863109911

[email protected]

No. 001, Industrial Park, Nanjiao Town, Zhoucun District, Zibo City, Shandong Province, P.R.China

Mon - Fri, 9am - 5pm

BOFENG manufactures mine auxiliary fans for local ventilation at underground development headings, blind ends, raises and other working areas. Connected to ventilation ducting, these fans supply fresh air or extract air locally while working with the mine's main ventilation circuit.

The range covers FK, FKD, FB, FBD, FBC and FBCD axial and counter-rotating auxiliary fans. Start with forcing or exhausting duty and the required airflow at the duct outlet or extraction inlet. Duct diameter, length, resistance, leakage and site protection requirements determine the suitable fan configuration.

Shandong Bofeng Fan Co., Ltd. provides model recommendations, performance curves, connection information and quotations based on your operating requirements. Fan size, motor power, duct transitions, silencers and control options can be reviewed as part of the proposed supply.

Mine Auxiliary Fan Series Comparison

The table below provides a quick comparison of the auxiliary fan series based on configuration, explosion-proof requirement and suitable mine application.

Series	Motor / Configuration	Explosion-Proof	Suitable Mines	Key Feature
FK	Single motor	No	Metal mines and non-metal mines	Standard auxiliary ventilation for routine local airflow supply
FKD	Dual motor, counter-rotating	No	Metal mines and non-metal mines	Higher pressure support for longer ducts or higher-resistance conditions
FB	Single motor	Yes	Coal mines, and metal or non-metal mines with explosion-proof requirements	Safe auxiliary ventilation for explosion-proof duty
FBD	Dual motor, counter-rotating	Yes	Coal mines, and metal or non-metal mines with explosion-proof requirements	Explosion-proof design with stronger pressure performance for demanding duct ventilation
FBC	Single motor	Yes	Coal mines, and metal or non-metal mines with explosion-proof requirements	Local extraction through negative-pressure-rated ducting
FBCD	Dual motor, counter-rotating	Yes	Coal mines, and metal or non-metal mines with explosion-proof requirements	Higher-pressure local extraction for higher-resistance duct systems

Confirm the selected model, motor, protection requirements and applicable product approval against the actual project conditions.

Request an auxiliary fan selection with your duct-end airflow, duct diameter and length, ventilation duty, voltage and site requirements.

FK Series Auxiliary Forcing Fan

FKD Series Auxiliary Counter-Rotating Forcing Fan

FBD Series Flameproof Counter-Rotating Auxiliary Fan

FB Series Flameproof Auxiliary Forcing Fan

FBC Series Flameproof Auxiliary Fan

FBCD Series Explosion-Proof Counter-Rotating Auxiliary Fan

Forcing and Exhausting Auxiliary Ventilation

In a simple forcing arrangement, fresh air enters through the duct and return air travels outside it towards the designated return route. In an exhausting arrangement, fresh air approaches along the roadway while the duct carries extracted air away.

Selection Item	Forcing / Blowing	Exhausting / Extraction
Air movement	The fan pushes fresh air through the duct towards the working area.	The fan draws air from an inlet near the working area through the duct.
Duct pressure	The delivery duct downstream of the fan is under positive pressure.	The suction duct upstream of the fan is under negative pressure.
Duct construction	Positive-pressure-rated lay-flat, rigid or other suitable ducting.	Reinforced or rigid ducting rated to resist collapse under suction.
Effect of leakage	Outward leakage reduces the air reaching the delivery outlet.	Inward leakage adds air to the duct without increasing extraction at the working-area inlet.
Airflow to specify	Required airflow at the delivery outlet near the working area.	Required extraction at the duct inlet near the working area.

Match the fan location, fresh-air availability and discharge route to the mine ventilation plan. A forcing fan cannot be treated as an exhaust fan simply by reversing its motor. See the forcing and exhausting ventilation guide for the overall arrangement.

Duct-End Airflow and Auxiliary Fan Selection

Specify the airflow needed at the delivery outlet or extraction inlet, not just the fan airflow. Leakage can reduce delivered air in a forcing system or add unwanted intake along an exhaust duct. The fan must be selected for the required end airflow together with the connected system resistance.

Input	Information to Provide
Required airflow	Airflow in m³/s or m³/min and its location: at the fan, delivery outlet or working-area extraction inlet.
Duct diameter and type	Internal diameter, duct construction and pressure rating. Include the existing duct specification where available.
Duct length and route	Initial and planned maximum length, bends, branches and transitions. A route sketch or layout drawing is useful.
Leakage and condition	Joint details, damaged sections and any available leakage data.
Pressure and air conditions	Static or total pressure if known, together with altitude, temperature and relevant conveyed-air conditions.
Operating point	Airflow and pressure together on the fan curve at the intended speed and air conditions, including motor loading and accessory losses.

Check both the current and planned duct lengths. Extending the duct changes system resistance, so motor power or a fixed delivery-distance claim alone is not enough for selection. Keep static and total pressure requirements separate; maximum airflow and maximum pressure are not one operating point.

When pressure is unknown, send BOFENG the duct layout, required duct-end airflow and any existing fan curve or nameplate information. Our technical team can review duct resistance and leakage for preliminary selection. Include the duct inlet or outlet position and the ventilation arrangement around the working area.

Duct Connections and Optional Equipment

For a replacement fan or an existing duct system, confirm the actual interfaces before ordering. The fan model number alone does not establish the duct connection size.

Item	Project Information
Duct interfaces	Actual connection diameter, flange or coupling details, and interface photographs or drawings. Identify any required adapter or transition.
Installation and access	Available space, transport constraints, support arrangement, lifting requirements and maintenance access.
Silencers and transitions	Required inlet or outlet accessories, their dimensions and their contribution to system pressure loss.
Power and controls	Voltage, frequency, starting method and any speed-control requirement. VFD suitability depends on the motor and operating environment.
Scope of supply	Identify the ducts, connections, supports, silencers, controls and technical documents to include in the quotation.

Accessories and control equipment are included only as agreed in the quotation and must suit the operating environment.

Mine Auxiliary Fan Projects

Ventilation ducting along an underground iron mine roadway

FBD auxiliary fan installed in the underground iron mine — FBD Auxiliary Fan Installation

Connection between the FBD auxiliary fan and ventilation duct — Fan-to-Duct Connection

Actual on-site operating data for this installation, reflecting the connected duct system and site conditions rather than catalog performance ratings.

View More Production Cases

Need Help Selecting an Auxiliary Fan?

Send your required duct-end airflow, duct diameter and length, forcing or exhausting duty, voltage, frequency and site conditions. BOFENG will provide a recommended fan model, the corresponding performance curve, connection information and quotation.

Request Fan Selection

Certifications, Patents & Compliance

Selected certificates include CE, ISO 9001, ISO 14001 and ISO 45001. Additional documents such as MA/KA mining product certificates, patent certificates, inspection reports and technical files can be provided upon request for project review and supplier evaluation.

Shandong Bofeng Fan EU CE certificate for fans, Machinery Directive 2006/42/EC and EMC Directive 2014/30/EU

CE · UDEM

EU CE Certificate (Machinery & EMC Directives)

ISO 14001:2015

Environmental Management System Certification

ISO 45001:2018

Occupational Health and Safety Management System Certification

ISO 9001:2015

Quality Management System Certification

Frequently Asked Questions

An auxiliary fan in mining is a local ventilation fan used to supply or exhaust air in underground zones where the main ventilation system cannot provide enough airflow.

It sends airflow to development headings, blind ends, raises, drifts, and other work areas that need reliable local ventilation.

An auxiliary fan serves local ventilation close to the working face, while a booster fan increases pressure in a wider ventilation circuit or along a long airway.

Yes. Mine auxiliary fans are normally connected to ventilation ducts to deliver fresh air or extract contaminated air from specific underground areas.

A mine ventilation duct is a ducting system used with auxiliary fans or blowers to move air to or from underground working areas that need local ventilation.

Choose based on airflow, pressure, duct diameter, duct length, resistance loss, operating mode, and site safety requirements. Share your working conditions and we can recommend a suitable model.

For coal mines or sites requiring explosion-proof equipment, FB, FBD, FBC, and FBCD series are common choices. FBD and FBCD counter-rotating models provide stronger pressure for long ducts or high-resistance ventilation.

Yes. Fan size, motor power, materials, accessories, duct connections, silencers, control panels, and VFD options can be configured to match real underground conditions.

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