Specifications


Solution3.4InstallationandOperationManual
 37
8.4.2 WHYTHEFLUESYSTEMSHOULDPENETRATETHEHIGHESTHEATEDSPACE
Whenitiscoldoutside,thewarmairinthehouseisbuoyantsoittendstorise.Thistendencyof
warmairtorisecreatesaslightpressuredifferenceinthehouse.Called‘stackeffect’,itproduces
a slightly
 negative pressurelow inthe house (relativetooutside) and a slightlypositive pressure
zone highin the house. If thereis nofire burning in a heater connected to a flue system that is
shorterthan the warm space inside thehouse, the slightnegative pressure  lowinthe
housewill
competeagainstthedesiredupwardflowinthefluesystem.
There are two reasons why the flue
systeminthehouseatrightwillcold
downdraught when it is cold outside
and there  is no fire burning in the
woodfire.First,theflue systemruns
up the outside of the house, so the
airinitiscolderanddenserthanthe
warm air in the house. And second,
the flue system is shorter than the
heated space of the house, meaning
the negative pressure low in the
house will pull outside air down the
flue system, through the wood fire
and into the room. Even the finest
wood fire will not work well when
connectedtothisfluesystem.
8.5 INSTALLINGTHEFLUECONNECTOR
Thefluehas beencalled‘the weaklink’in the safetyofwoodheating systemsbecausefailureto
installtheflueconnectorproperly(whichhasbeencommoninthepast)canresultinhousefires.
Thebestflueisonethatrisesstraightupfromthewoodfiretothebase
ofthefluesystemwithno
elbows.Straightassembliesarelesslikelytocauseproblemslikesmokeroll‐outwhenthedooris
openedforloading.Theyarealsomorestableandeasiertomaintainthanassemblieswithelbows.
Horizontalrunsofflueshouldbeavoidedwherepossiblebecausethey
reducefluesystemdraft.
