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Perm ratings
Found 2 free book(s)Condensation Fact Sheet - MBMA
www.mbma.comshows their water vapor transmission rates (perm ratings). The North American Insulation Manufacturers Association (NAIMA) recommends that metal building insulation be faced with a vapor retarder having a permeance of not greater than 0.10 perms. Besides the most popular facings, the industry provides special
Cabinet Unit Heaters - Mestek
www.literature.mestek.comRATINGS AND SPECIFICATIONS. Floor . Floor Inverted Flow. Recessed Wall. WI FI. Recessed Wall Inverted Flow. Ceiling Recessed . Ceiling RC. MODEL ARRANGEMENT NUMBER MODELS, ARRANGEMENTS AND SIZES ARE DESIGNATED AS FOLLOWS: ... PERM. PERM. PERM. Length (In) 19-3/4 27-3/4: CABINET UNIT HEATERS .31: UNIT : WATER: UNIT = =