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Originally Posted by fl70
Wattage.
What SSR did you order the 25 or the 40?
If you find the cost of the 4" rock wool prohibitive you could always use R13 (3-1/2") unfaced fiberglass insulation.
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I bought a 40A SSR just to be safe, was only an extra $3.
Actually, I found the rock wool to be not much more than the regular fiberglass insulation.