With all due respect to my good friend, this is simply not true. Unless the screen is also the heat source, there is no heat energy via conduction added by a screen in this configuration. First of all the laws of physics don't allow for it, and secondly I've done several experiments to demonstrate how a screen between the load and the heat source actually robs thermal energy from getting to the load (from a cold start). My youtube channel has a few videos about exactly this.The problem is that the raised screen also heats up and so adds an element of conduction.
That is also why toast comes out of a toaster with a "shadow" where the metal cage gets between the heater and the toast.
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