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EQUIVALENT VENT LENGHT (EVL)
The longer the run of pipe in your installation, the more restriction there is
in the system. Therefore, larger diameter pipe should be used for longer
runs.
Use 4" pipe if you have more than 15 feet of Equivalent Vent Length
(EVL).
Horizontal runs shall not exceed 10 feet of EVL.
To calculate EVL, use the following conversions table:
Qty
Type of pipe
1
90° elbow or "T"
1
45° elbow
1 ft
Horizontal pipe run
1 ft
Vertical pipe run
NOTE: At altitudes above 3,000 feet, we suggest the use of 4" diameter
vent at an EVL of 7 feet or more.
Here is an example on how to calculate the EVL of your installation. (See
Figure 15)
(3 x 4' of vertical length = 12' x 0.5 = 6 EVL) + (1 x elbow or "T" = 5 EVL) +
(2 x 1' of horizontal length = 2 EVL)
Total EVL = (6 + 5 +2) = 13. So 3" diameter vent is allowed
Note: Do not count the outside termination (goose neck) in the EVL
calculation.
INSTALLATION CONFIGURATIONS
A. HORIZONTALLY THROUGH WALL (refer to figure 14, 15, or 17)
NOTE: Follow Vent chimney manufacturer's instructions.
1.
Position stove, adhering to clearances shown in Figures 1 & 2.
2.
Determine position of hole in wall; directly behind stove exhaust vent
(refer to figure 4).
3.
Always maintain 3" clearance from combustible materials.
4.
Install Vent wall thimble per Vent manufacturer's instructions.
5.
Attach enough piping to penetrate and extend at least 6 inches
beyond the exterior wall. There should always be at least one foot of
vertical rise for each foot of horizontal run (see Appendix A). At least
3 feet of vertical rise are needed in all cases. A longer vertical rise will
favour a better exhaust.
6.
To reduce the risk of smoke spillage, never terminate with a horizontal
run. If your system terminates with a horizontal run, add at least 3 feet
of vertical rise (see Appendix A).
7.
Attach cap and seal outside wall thimbles with non-hardening
waterproof mastic.
EVL equivalent(ft)
5
3
1
0.5
9
Figure 14
Venting through wall
Figure 15
Venting trough wall
Termination should not be located so that hot exhaust
gases can ignite trees, shrubs, or grasses or be a
hazard to children. Exhaust gases can reach
temperatures of 500ºF and cause serious burns if
touched.
Locate terminations: A) not less than 3 feet above any
forced air inlet located within 10 feet; B) not less than 4
feet below or horizontally from, or one foot above, any
door, window or gravity air inlet into any building; C) not
less than two feet from an adjacent building and not less
than 7 feet above grade when located adjacent to a
public walkway. Mobile home installations must use a
spark arrester. Other restrictions may apply, such as the
need to maintain a minimum distance to a gas meter.
US and Canadian Standards may vary.
Consult the vent manufacturer's instructions.
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