Metal shield on Arduino Yun


What is the purpose of the metal shield on the arduino yun ?. I thought removing the metal shield to place heatsinks. Thanks.

Cover WIFI and Linino sections and is exactly as stated a shield, for RF purposes. If worried on heat then could add sink to the shield, or add small fan for cooling.

So far I have been running one in 100 degree plus in the shade.
With just a small micro fan for cooling.