Negative Pressure; Draft; Chimney And Exhaust Connection - Quadra-Fire CASTILEI-MBK Installation Manual

CASTILE INSERT
C. Negative Pressure
Negative pressure results from the imbalance of air avail-
able for the appliance to operate properly. It can be strongest
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 HVAC air handling system
• Upper level air leaks such as:
- Recessed lighting
- Attic hatch
- Duct leaks
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
WARNING
Risk of Asphyxiation!
Negative pressure can cause spillage of combustion
fumes and soot.
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D. Draft
Draft is the pressure difference needed to vent an appli-
ance successfully. When an appliance is drafting suc-
cessfully, 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 fi re.
Considerations for successful draft include:
• Preventing negative pressure
• Location of appliance and chimney
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
E. Chimney and Exhaust Connection
1.
Chimney & Connector: Use 3 or 4 inch (76-102mm) diameter
type "L" or "PL" venting system. It can be vented vertically or
horizontally.
2. Mobile Home: Approved for all Listed pellet vent. If using the
3 inch (76mm) vertical Top Vent Adapter Kit or the 3 to 6 inch
(76-152mm) Top Vent Offset Adapter, use Listed double wall
fl ue connector. A Quadra-Fire Outside Air Kit must be used with
manufactured home installations.
3. Residential: The 3 inch (76mm) vertical Top Vent Adapter Kit and
the 3 to 6 inch (76-152mm) Top Vent Offset Adapter are tested
to use 24 gauge single wall fl ue connector or Listed double wall
fl ue connector to Class A Listed metal chimneys, or masonry
chimneys meeting International Residential Code standards for
solid fuel appliances.
4. INSTALL VENT AT CLEARANCES SPECIFIED BY THE
VENT MANUFACTURER.
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. Secure exhaust venting system to the appliance with at least
3 screws. Also secure all connector pipe joints with at least 3
screws through each joint.
6. DO NOT INSTALL A FLUE DAMPER IN THE EXHAUST VENT-
ING SYSTEM OF THIS UNIT.
7. DO NOT CONNECT THIS UNIT TO A CHIMNEY FLUE SERVING
ANOTHER APPLIANCE.
NOTE: All pipe must be welded seam pipe whenever possible.
Seal pipe joints with high temperature silicone (500°F [260°C]
minimum rated only).
NOTE: If burning shelled fi eld corn, you must use approved
venting specifi cally designed for corn. Follow the instructions
from the venting manufacturer.
7022-514C July 7, 2015