Here is another Ormerod Mod to provide extra cooling,

It is currently designed to hold a 50mm fan, however it is easily adjusted to hold a 40mm or 60mm fan.

This 3-part bracket simply replaces the lower of the two Z bearing mounting brackets on the Ormerod and allows for an additional cooling fan to be mounted on the adjustable arm.

I have mine directed at the center of the print bed, as the print progresses the fan will raise with the Z access.