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3100 Wood Stove Series (ACC)
C. Negative Pressure
Draft is the pressure difference needed to vent appliances
successfully. Considerations for successful draft include:
•
Preventing negative pressure
•
Location of appliance and chimney
Negative pressure results from the imbalance of air avail-
able for the stove to operate properly. Causes for this imbal-
ance 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 condi-
tioning
•
Imbalances of HVAC air handling system
•
Upper level air leaks
•
Recessed lighting
•
Attic hatch opening
•
Duct leaks
Location
Not
Recommended
Windward
Outside Air Kit Termination Cap
Figure 6.1
Page 6
Recommended
Recommended
Location
Marginal
Location
Multi-level Roofs
7033-277N
To minimize the affects of negative air pressure the following
must be considered:
•
Install the outside air kit. Install the intake on the
side of the house towards prevailing winds during the
heating season.
•
Ensure adequate outdoor air is supplied for combus-
tion appliances and exhaust equipment.
•
Ensure furnace and air conditioning return vents are
not located in the immediate vicinity of the appli-
ance,
•
Avoid installing the appliance near doors, walkways
or small isolated spaces.
•
Recessed lighting should be of "sealed can" design;
attic hatches weather stripped or sealed; and attic
mounted duct work and air handler joints and seams
taped or sealed.
WARNING
Asphyxiation Risk.
• Negative pressure can cause spillage of com-
bustion fumes, soot and carbon monoxide.
• Appliance needs to draft properly for safety.
Location
Location NOT
Recommended
Leeward
R
August 3, 2015
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