Thanks for the confirmation Rick.

I did think that was what is was for because the heat sink fins are now hidden.

It's obviously engineered to ensure that heat never goes over its maximum design temperature.

Cheers,
Steve M

#1: 8000s, 5500HC, 8000s, 861v8, 800Dv4, HD621
#2: 6000s, 6000C, 5000s, 6000s, 568.2mm, 598DP, 511
#3: 5500s, 5000C, 5000s, 561, 800v3, 518