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C. Negative Pressure
WARNING
Risk of Asphyxiation!
Negative pressure can cause spillage of combustion
fumes and soot
Negative pressure results from the imbalance of air
available 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
appliances 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
D. Draft
Draft is the pressure difference needed to vent an
appliance 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 building
envelope. This helps to produce more draft, especially
during lighting and die-down of the fire.
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
•
Down drafts
•
Tight sealing construction of the structure
•
Mechanical exhausting devices
September 27, 2018
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.
NOTE: The appliance exhaust outlet is designed to
accommodate 3 inch venting. Use of 4 inch
venting requires the use of a 3-to-4 inch exhaust
vent increaser in addition to any other venting
components needed, sold separately.
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 flue connector. A
Quadra-Fire Outside Air Kit (OAK-3) 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
flue connector or Listed double wall flue connector to
Class A Listed metal chimneys, or masonry chimneys
meeting International Residential Code standards for
solid fuel appliances.
4. INSTALL VENT AT CLEARANCE SPECIFIED BY THE
VENT MANUFACTURER.
5. 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 VENTING SYSTEM OF THIS APPLIANCE.
7. DO NOT CONNECT THIS APPLIANCE 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).
USE ONLY RECOMMENDED VENTING
COMPONENTS; OTHERWISE MAKESHIFT PARTS
MAY RESULT IN PROPERTY DAMAGE, PERSONAL
INJURY, OR DEATH.
7082-153D
TREKKER INSERT
WARNING
15
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