5100-I ACT WOOD INSERT
April 21, 2010
R
438-0380E
C. Negative Pressure
Draft is the pressure difference needed to vent appliances
• Location of appliance and chimney
Negative pressure results from the imbalance of air avail-
• Range hoods
heaters and other combustion appliances
• Clothes dryers
• Location of return-air vents to furnace or air condi-
tioning
Recommended
Location
Marginal
Location
Location
Not
Recommended
Recommended
Location
Location NOT
Recommended
Multi-level Roofs
Windward
Leeward
Outside Termination Cap
Figure 6.1
• Recessed lighting
• Attic hatch opening
side of the house towards prevailing winds during the
heating season.
-
combustion fumes and soot
• Appliance needs to draft properly for
safety.
WARNING
• Ensure furnace and air conditioning return vents are
not located in the immediate vicinity of the appliance,
or small isolated spaces.
• Recessed lighting should be of “sealed can” design;
attic hatches weather stripped or sealed; and attic
taped or sealed.