Quadra-Fire CASTILE - Negative Pressure Considerations; Draft Requirements

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October 27, 2011
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Castile & Santa Fe CE Insert
7069-101B
Vent Congurations
Toreduceprobabilityofreversedraftingduringshut-down
conditions Hearth &HomeTechnologies strongly recom-
mends:
 • Installingthepelletventwithaminimumverticalrun
of1.52m.Preferablyterminatingabovetheroofline.
 • Installingtheoutsideairkitatleast1.22mbelowthe
venttermination.
Topreventsootdamagetoexteriorwallsofthehouseand
topreventre-entryofsootorashintothehouse:
 • Maintainspeciedclearancestowindows,doorsand
airinlets,includingairconditioners.
 • Vents should not beplacedbelow ventilated softs.
Runtheventabovetheroof.
 • Avoidventingintoalcovelocations.
 • Ventsshouldnotterminateunderoverhangs,decks
orontocoveredporches.
 • Maintainminimumclearanceof305mmfromthevent
terminationtotheexteriorwall. Ifyouseedeposits
developingonthewall,youmayneedtoextendthis
distancetoaccommodateyourinstallationconditions.
Negative pressure results from the imbalance of air avail-
ablefortheappliancetooperateproperly.Itcanbestron-
gestinlowerlevelsofthehouse.
Causesinclude:
• Exhaustfans(kitchen,bath,etc.)
• Rangehoods
• Combustionairrequirementsforfurnaces,waterheaters
andothercombustionappliances
• Clothesdryers
• Locationofreturn-airventstofurnaceorairconditioning
• Imbalancesoftheheating/coolingairhandlingsystem
• Upperlevelairleakssuchas:
 - Recessedlighting
 - Attichatch
 - Ductleaks
WARNING! Risk of Asphyxiation! Negativepressurecan
causespillageofcombustionfumesandsoot.
C. Negative Pressure
NOTICE: Hearth & Home Technologies assumes no
responsibilityfortheimproperperformanceofthechimney
systemcausedby:
• Inadequatedraftduetoenvironmentalconditions
• Downdrafts
• Tightsealingconstructionofthestructure
• Mechanicalexhaustingdevices
D. Draft
Tominimizetheeffectsofnegativeairpressure:
• Installtheoutsideairkitwiththeintakefacingprevailing
windsduringtheheatingseason
• Ensureadequateoutdoorairforallcombustionappliances
andexhaustequipment
• Ensurefurnaceandairconditioningreturnventsarenot
locatedintheimmediatevicinityoftheappliance
• Avoidinstalling the appliance near doors, walkways or
smallisolatedspaces
• Recessedlightingshouldbea“sealedcan”design
• Attichatchesweatherstrippedorsealed
• Atticmountedductworkandairhandlerjointsandseams
tapedorsealed
Onnominalheatoutputthecombustionbloweroperatesat
2053rpmdeveloping0.33m^3/s.Thisistheminimumrequire-
mentforthesupplyofcombustionair.
Draftisthepressuredifferenceneededtoventappliances
successfully.Whenanapplianceisdraftingsuccessfully,all
combustion byproducts are exiting the home through the
chimney.
Installthroughthewarmairspaceenclosedbythebuild-
ingenvelope.Thishelpstoproducemoredraft,especially
duringlightinganddie-downofthere.
Considerationsforsuccessfuldraftinclude:
• Preventingnegativepressure
• Locationofapplianceandchimney
Tomeasurethedraftornegativepressureonyourappliance
usea magnahelic or a digital pressure gauge capable of
reading0-.13inchesofwatercolumn(W.C.).
The appliance should be running on high for at least 15
minutesforthetest.
Withthestoverunningonhighyoushouldhaveanegative
pressureequaltoorgreaterthanthenumbergiveninthe
chartbelow.Ifyouhavealowerreadingthanyoundon
thechart,yourappliancedoesnothaveadequatedraftto
burnthefuelproperly.
Minimum Vacuum Requirements: .095