Does fireplace screen work as Faraday Shield? I have never thought about it before as I got house with chimney just recently. And I have noticed, that simple metallic fireplace screen (which made as metallic grill/lattice) screens a really significant part of warm. At the same time it doesn't become hot. 
I'm wondering, does it because it works as Faraday shield and screens in this way Thermal radiation, which is essentially is electromagnetic radiation, or I'm totally wrong?

UPD: besides simple measurement of temperature in the room, I've made some experiment: I've measured heating of black circle on paper, hanged on same distance from fireplace with screen and without (of course there were two similar papers, not same one). I've measured heating using infrared thermometer. It shown me that with screen heating was only 1 Celsius degree on 2 minutes, while without screen - almost 3.5. Is it because of absorption/reflection? 
 A: The wavelength of infrared is far too small to make the screen work as a Faraday shield.  Instead, the individual wires cast shadows.  The overall coverage does not seem all too large, however, so I don't expect much more than 10% to be absorbed/reflected.  The grid, however, will provide a convection barrier for hot air.
So you have a layer of hot air and a layer of colder air starting with the grid.  The transition to a more dense medium causes a certain amount of reflection to occur at the border.
For a similar reason one put radiators below single-pane windows: the layering of the moving sheet of warm air before the comparatively static cold air at the glass reflects warmth back into the room.
A: Photons from the fire are not coherent, and their e-field does not re-inforce - the e-field transitions are around the waveleght of the blackbody radiation from the fire - around 50$\mu$m depending on temperature. There will be electron displacement, but the magnitude is much smaller and less coherent than normally described in relation to the Faraday Shield. Microwaves and radio waves have much longer wavelength at least 1mm.
Three means of transmission of heat; conduction, convection and radiation. Your fireplace uses all three to some extent. Colour has an impact on radiation absorption, black absorbing most.
