Context

89mm fibre glass insulation 2.1 RSI(R12) for sound attenuation.
140mm rigid foam insulation 5.2 RSI(R30) in cooler/ freezer walls.

R-12 - коэффициент теплоотдачи ( по Американской системе) SI - международная система единиц (American System of Units, french "Le Systeme Internacional d'Unites")

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