I believe this narrow room would have once housed the steam engine that drove the fan itself, which would have been on the other side of the central grate.

The Engine House

I believe this narrow room would have once housed the steam engine that drove the fan itself, which would have been on the other side of the central grate.
Credit
Toby J
Taken
03/06/2018
Camera
Nikon D7100
ISO
800
Shutter
1100 second
Aperture
ƒ/8
Focal Length
13mm
Lens
Tokina AT-X 116 PRO DX II 11-16mm F2.8
License
CC BY-NC 4.0
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SS Castle Guibal Fan House