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<blockquote data-quote="EdMuse" data-source="post: 1276034" data-attributes="member: 564149">Nothing&#039;s gonna burn in there.&nbsp; I mean, we think of paper as being pretty flamable, right?&nbsp; Its flashpoint is 455 degrees F.&nbsp; Alcohol doesn&#039;t even boil until 168 degrees F.&nbsp; So, I&#039;m not worried about anything flaring up at 150 degrees F.&nbsp; My problem is that I just haven&#039;t found a suitable insulation.&nbsp; I don&#039;t think aluminum foil alone will do it, as metal transmits heat too easily.&nbsp; I was thinking about foil-faced plywood panelling, foil side down, but that seems pretty cheesy.&nbsp; I figure there must be something better.Also, it might be academic, depending on what I use, but I&#039;m trying to consider also whether I should insulate the ducts or the HU.&nbsp; If I find something to wrap around the ductwork, the hot air will be going where it&#039;s supposed to go: out the vents.&nbsp; If, for instance, I surround the HU underneath and on the sides, and route this sort of &quot;trench&quot; of insulation back to the vent in the dash, that would keep the hot air out of the area of the HU, while allowing the hot air produced by the HU itself to vent.&nbsp; Still, the two are so close together that I may not be able to do one without the other.-EdM.</blockquote>

[QUOTE="EdMuse, post: 1276034, member: 564149"] Nothing's gonna burn in there. I mean, we think of paper as being pretty flamable, right? Its flashpoint is 455 degrees F. Alcohol doesn't even boil until 168 degrees F. So, I'm not worried about anything flaring up at 150 degrees F. My problem is that I just haven't found a suitable insulation. I don't think aluminum foil alone will do it, as metal transmits heat too easily. I was thinking about foil-faced plywood panelling, foil side down, but that seems pretty cheesy. I figure there must be something better. Also, it might be academic, depending on what I use, but I'm trying to consider also whether I should insulate the ducts or the HU. If I find something to wrap around the ductwork, the hot air will be going where it's supposed to go: out the vents. If, for instance, I surround the HU underneath and on the sides, and route this sort of "trench" of insulation back to the vent in the dash, that would keep the hot air out of the area of the HU, while allowing the hot air produced by the HU itself to vent. Still, the two are so close together that I may not be able to do one without the other. -EdM. [/QUOTE]

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