Cooling/demist fan 1.

Selected four 30mm fans. Here you see them with labels removed and anti skid tape adhered so they will not reflect and look nice.
Heat collected inside instrument module is not just from radios, transponder and EFIS/EIS.
Consider:
Solar heating of panel.
Firewall/footwell radiant/convection heating (running IC engine up front plenty willing to help out here)
Other electrical gizmos
Y10-04-22