Ventilation is a critical part of mining with the constant supply of air being needed by the miners and horses to survive. Explosive gases (firedamp) were rare in Cleveland, but not totally unknown, a gas explosion at Lingdale in 1953 killed 8 miners. Lack of oxygen (blackdamp) is main danger locally, this can very quickly cause death by suffocation.
In the early days of mining it was sufficient to ventilate with a furnace at the bottom of a shaft, this acts like a simple chimney with rising hot air drawing the fresh air into the mine. It does however require a constant supply of fuel and supervision.
The next major development was fans on the surface driven by steam engines, the most popular design locally being the Guibal Fan invented in 1860, when ironstone mining was booming. It consisted of a large wooden fan moving at a relatively low speed (30-50 rpm). The remains of these fans can be seen at the “SS Castle” at Eston and at Huntcliffe.
Between 1910-1920 most local mines switched from steam to electricity, at this point it became possible to use smaller, faster Sirocco fans (300 rpm)
A modern reconstruction can be viewed at the Cleveland Ironstone Mining Museum, whilst an in-situ example slowly rusts away at Grinkle.