Hi, can someone please tell me what the
"R" rating is on the old galvanized duct? Also, this duct is insulated with insulation.
Is R8 really better than the normal R 4.2?
Metal duct doesn't have a R rating.
Its the liner/insulation that has the R value. And it depends how thick and it is.
R8 transfers heat only have as fast as R4.
So yes, it is better.
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How many times must one fix something before it is fixed?