Epsilon 60mm Blower Fan Holder

This is an adapter to hold a 60x60x15mm blower fan, it fits inside the rear I/O plates of the Spectracom Epsilon EC2S frequency reference.

This model of reference clock runs extremely hot unless forced air is provided in the rack, adding a standard 60mm blower fan lowers temperatures a fair bit at the cost of noise.

I found the GDSTIME fans (available via Aliexpress and eBay et al) to be a very light press fit so I didn't add any additional retention mechanism for the fan.
Adding good ret