Quote:
Originally Posted by MetroMPG
If not, you could do a partial or even full lower grille block, depending on cooling location/requirements of the electronics.
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I do that routinely in cool to cold weather, using urethane water-pipe insulation; the split slips right over the horizontal grill ribs. Two lengths will block most of the lower opening, with one piece alone for temps up to 60 deg F or so.