After a long 2.5 hour mission in DCS with my squad and 8KX, I found my glasses and lenses on the verge of fogging and my face was very warm. I know there are fan mods out there that blow air around your forehead but they do not provide airflow inside. I have been flying FPV RC for many years now and my Fatshark FPV goggles have a nice little fan the gently flows air inside the goggles for those warm, outside flights. They work very well and are very quiet.
So I started looking for a way to provide the same type of airflow to my 8KX and found the comfort kit faceplate has a little vent that was taped up (for light leaks I guess). I tried to get the same fans that the Fatshark goggles had but could not find replacements but found something close on Amazon. Little 20mm fans that use up to 5 volts (5 volt max!) so I ordered them along with a side type fan. I ended up throwing together a 3D printed design that would fit in my DAS and flow air through the little vent. I cut out the vent opening and used a single cell lipo (3.7 volts) to test it out. It seems to work very well so far with a very gentle airflow over the lenses and out the foam cut outs for the glasses. You can barely hear it and it is all very light. My next step is I ordered the FatShark replacement On/Off switch and I will pull power (5 volts) from the USB C connector on the bottom. I will let you know how it goes on the next long mission which will be the true test;