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TheKenmore(K90) isagas-fireddirect venthotwaterboiler with castaluminumboiler sections.A
revolutionarycastaluminumheatexchangermeansbetterheattransferandthermalstoragethan
similarly sizedcastironboilers,whichresultsin higherefficiency. Theheatingsystemwaterabsorbs
largeamountsof heatfromthecastaluminumheatexchanger,coolingthefluegasesandcausing
condensation.Sealedcombustion,premix gasburner,andlow flametemperaturemeansdrastically
reducedCOandNOxemissions,whichcontributeto acleanerandhealthierenvironment.
TheK90, unlike normalresidentialatmosphericandinduceddraft units,takesits combustionair
directly from theoutdoors(sealedcombustion)anddoesnotcompetewith buildingoccupantsfor fresh
air. Sealedcombustion(alsoknownas"direct vent") isthesafestandbestway to obtainplentyof
cleancombustionair. Theinduceddraft fandrawsintheoutsidecombustionair, thentakesthecooler
flue gasesfrom theboiler unit andprovidesapositiveremovalof theflue gasesfrom thebuilding
throughinexpensiveandreadilyavailablePVCandCPVCpipes.
I
_T_N_ _rslLE_ WaTE_ i.
Tilt'
FIGURE 1 Q90 BOILER
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