Standard:ISO140-10:1991
Classification:
ISO717-1:1996
Absorptionarea:
10m²
ReductionringinPurmoAirmodelsandreductionelementin
Telescopemodelsimprovesoundinsulationbyabout3dB.
Purmo Air sound diagram
Diameter100mmiron-sheet,
ductwithoutadditionalinsulation.
abbreviations
f
Frequency,Hz
Dn,e
Soundtransmissionlossfor1/3octaveband,dB
Dn,e,w
Soundinsulationindex,dB
C
Frequencyweightingparameter,general,dB
Ctr
Frequencyweightingparameterfortrafficnoise,dB
Purmo Air Telescope sound diagram
400x25x250mmrectangular
ductwithoutadditionalinsulation.
pressure difference and leakage airflows
Toachievetheproperperformanceofventilationandairflow
throughthefreshairradiator,thedesignvalueofpressure
differencecannotbetoohigh.Theappropriatepressuredifference
dependsontheair-tightnessofthebuilding:themoreleakythe
buildingthehighertherateofleakageairflow(infiltration)inthe
totalairchangerate.Thedesignvalueof∆p=15Pashouldnotbe
exceededevenforanairtightbuilding.Theshapeandsizeoftheair
ductbehindtheradiatoraswellastheoutletgrillewillcreate
pressureloss(30-50%),
whichhastobetakeninto
accountindesign.Incase
ofexcessiveleakage
airflowrate,theheat
outputofradiatorsmight
turnouttobeinsufficient.
Thisuncertaintyshouldbe
takenintoconsideration
whensizingtheradiator.
82
Afreshapproachtoheatingyourhome
PuRmO AIR
83
sound insulation
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