Heatilator • CI60 • 4013-031 Rev M • 10/06
5
2
2
Getting Started
A. Design and Installation Considerations
Draft is the pressure difference needed to vent
¿
replaces
successfully. Considerations for successful draft include:
• Preventing negative pressure
• Location
of
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replace and chimney
B. Negative Pressure
Negative pressure results from the imbalance of air avail-
able for the
¿
replace to operate properly. Causes for this
imbalance include:
• Exhaust fans (kitchen, bath, etc.).
• Range
hoods.
• Combustion air requirements for furnaces, water heaters
and other combustion appliances.
• Clothes
dryers.
• L o c a t i o n o f r e t u r n - a i r v e n t s t o f u r n a c e o r a i r
conditioning.
• Imbalances of the HVAC air handling system.
• Upper level air leaks: recessed lighting, attic hatch
opening, duct leaks.
To minimize the effects of negative air pressure, the follow-
ing 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 combustion
appliances and exhaust equipment.
• Ensure furnace and air conditioning return vents are not
located in the immediate vicinity of the
¿
replace.
• Avoid
installing
the
¿
replace 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.
• Basement installations should be avoided due to stack
effect. Stack effect creates negative pressure in lower
levels. Hearth & Home Technologies recommends the
use of direct vent
¿
replaces in basements.
Asphyxiation Risk
Negative pressure can cause spillage of
combustion fumes and soot. Fire needs to draft
properly for safe operation.
WARNING
Check building codes prior to installation.
• Installation MUST comply with local, regional,
state and national codes and regulations.
•
Consult insurance carrier, local building inspector,
¿
re of
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cials or authorities having jurisdiction about
restrictions, installation inspection and permits.
CAUTION
When planning a
¿
replace installation, it is necessary to de-
termine the following information before installing:
• Where the fireplace is to be installed. See Sections
3 and 4.
• The vent system con
¿
guration to be used. See Sections
5 and 6.
• Gas supply piping. See Sections 7.
• Framing
and
¿
nishing details. See Sections 3, 6 and 8.
•
Whether optional accessories—devices such as a fan, wall
switch or remote control —are desired. See Section 12.
