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On the Thor Plant 750 F-53 coaches there is typically 1.25 inches clearance between the intake manifold and Thor's insulation. Most sound deading/ high temp insulation is 1/8 to 3/16 inches thick. As long as there is 1/2" clearance there is enough circulation to prevent problems. So I would think one or two layers would be fine. If course your coach is somewhat different.
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Jim & Roy Davis
2016 Hurricane 31S
1961 Rampside in tow
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