What Beseler Color Head is this? And what is this diffision disc?

Hello fellow silver traditionalists!!

I recently picked up a plethora of dkrm stuff and included was this beseler head, the seperate fan and hose....and this diffusion disc that had come loose.

A few questions....

What head is this?
For VC printing, mostly short exposures, is the cooling fan neccesary?

This diffiusion disc...Where does it go? Is it part of this head?

Many thanks and am so glad to have found this group.

I don't know what's the disc is for but the head is the Beseler Dichro DG. It needs an external blower.
I have the blue version as can be seen in the picture here. I have disassembled the head and there is no such disc inside so I don't think it belongs to the head. With two 200W bulbs inside it's quite hot, I don't recommend running it without the blower.