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Technical | Ventilation | Mechanical  >  Auxiliary fans

Auxiliary fans were used underground to provide ventilation to blind headings when driving new roadways or opening new faces.  They were usually driven by 3 phase electrical motors although compressed air versions were used where methane level exceeded the allowable level for electrical apparatus.  They were of the axial-flow type with the aerofoil section blades and motor(s) located inside a cylindrical steel casing.

The fan was located in a roadway carrying fresh air upstream of the junction with the heading  and was fed from a nearby control switch tapped into the electrical main. The air was carried from the fan to the face of the heading by canvas or PVC tubing. The tubing (or air-bagging as it was often known) came in lengths of about 30m and was  held in shape by a stiff spiral reinforcing wire which allowed it to be concertina’d together for transport.

After ventilating the working face, the air returned back down the heading and rejoined the air flow in the main roadway downstream of the fan.

aux fan internals -m

Woods twin-motor auxiliary fan  

heading fan -m

Typical auxiliary fan  set-up

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