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Fiberglass and foam board insulation work well because they

interfere with the convective flow essential to that mechanism. The tiny air- or

gas-filled spaces in the insulator frustrate heat flow because they greatly extend the

time necessary for convective and conductive flow to occur. Foe heat to move through such

a material, each cell -- and there are millions -- must relay the heat across it. The

longer it takes, the slower the heat flow.

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16y ago

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