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4 VENTING SYSTEM
4.1 General
Even though the chimney draft is mechanical, a suitable venting system will ensure a natural draft
which will prevent smoke spillage in your home if a power outage occurs. Moreover, a suitable
venting system configuration will help getting the best efficiency out of your stove when installed in
accordance with the required EVL (see Section 4.3 Equivalent Vent Length (EVL)).
Even the best stove will not function safely and efficiently as intended if it is not connected to a
suitable venting system.
4.2 Recommendations
In Canada, we recommend that you use a listed pellet vent that meets the CAN/ULC S609 or ULC/ORD
C441 Standard. A pellet vent listed to ULC S629M is also suitable for installation with this stove.
For the United States, we recommend that you use a listed pellet vent that meets the UL 641
Standard. A pellet vent listed to UL 103 is also suitable for installation with this stove.
This stove can be vented in an existing factory-built or masonry chimney with the addition of a
stainless steel liner, provided the chimney is more than 4" in diameter. The liner should be listed and
should meet the ULC S635 CAN/ULC S640 standard in Canada and the UL 1777 standard in the USA.
Refer to the instructions provided by the vent manufacturer, especially when passing through a wall,
ceiling or roof.
4.3 Equivalent Vent Length (EVL)
4.3.1 Recommended Exhaust Venting Diameter
Recommended venting system inner pipe diameter is 3". Use a 4" pipe if you have more than 15 feet
of Equivalent Vent Length (EVL).
To calculate the Equivalent Vent Length of your installation, use the following conversions:
Qty
1
1
1 foot
1 foot
• HORIZONTAL RUNS SHALL NOT EXCEED 9 FEET.
•
NEVER EXCEED 30 FEET OF EVL.
Cambridge Pellet Stove Installation and Operation Manual
Type of pipe
90° elbow or "T"
45° elbow
Horizontal pipe run
Vertical pipe run
CAUTION
Equivalent Length (EVL)
5 feet
3 feet
1 foot
0.5 foot
15
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