Mains voltage equipment cooling fan (Willington DE65)
This is a 120mm x 120mm square mains voltage fan.,depth 38mm. Bought it from Potts in Derby 40 years ago, the £5 sticker is still on it :-) Built like a tank, solid metal body. Would be ideal for cooling a big box of electronics, or extracting dust or fumes from a small paint booth, that sort of thing. It's not particularly quiet, so its for an intermittent use rather than always on. Of course it needs an electrically competent person to mount and wire it up, and ensure that the terminals are hidden and cannot come into contact with humans, animals or water.