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USSC 7
GUIDELINES FOR EXHAUST VENTING SYSTEMS DESIGN continued...
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Distance from bottom of termination and grade-1ft./305mm minimum. This is conditional upon the plants and nature of
grade surface. The exhaust gases are not hot enough to ignite grass, plants or shrubs located in the vicinity of the
termination. The grade surface must not be a lawn. Distance from bottom of termination and public walkway is 7ft./
2.1m minimum.
Distance to combustible materials-2ft./610mm. This includes adjacent building, fences, protruding parts of the struc-
ture, roof overhang, plants and shrubs, etc.
It is recommended that a single or double clean-out “tee” be installed at every 90
°
junction to enable collection of fly ash
and to permit periodic cleaning of the exhaust system. 90
°
elbows accumulate fly ash and soot thereby reducing
exhaust flow and performance of the stove.
Total length of horizontal vent must not exceed 48”(4ft.)/1,200mm. All joints in the vent system must be fastened by at
least 3 screws, and all joints must be sealed with RTV silicone sealer to be airtight.
When venting into an existing masonry or factory built chimney, the chimney must be cleaned, with all creosote re-
moved. The chimney must be a type suited for solid fuel. WARNING: The chimney and the chimney connections must
be kept clean an in good condition.
The “PL” vent or single wall stainless exhaust system must be installed so as to be GAS TIGHT! The vent manufacturer’s
installation procedures must be followed. In addition, pipe connections, joints and all pipe seams within the home
should be sealed with high temperature RTV silicone sealer.
The area where the chimney penetrates to the exterior of the home must be sealed with silicone or other means to
maintain the vapor barrier between the exterior and the interior of the home.
Where installations will be made in locations above 2,000 feet, it is recommended that your stove be installed with 4” pell
vent. At elevations above 3,000 feet, it is mandatory that a 4” pell vent be used for your installation.
NOTE: These are guidelines only. Proper venting is accomplished by design and common sense. In most
installations 3” inch diameter venting is adequate. If it does not vent properly you will have to change it
to 4”.
DO NOT CONNECT TO ANY AIR DISTRIBUTION DUCT OR SYSTEM