6
EQUIVALENT VENT LENGTH (EVL)
The longer the run of pipe in your installation, the
more restrictions there is in the system. Therefore,
larger diameter pipe should be used.
• Use 4” pipe if you have more than 15 feet of
equivalent vent length.
• Horizontal runs shall not exceed 10’ of EVL
• Recommended vertical runs to be a minimum
of 8’.
• To calculate EVL, use the following conversions:
90
o
elbow or “T” = 5 equivalent feet
45
o
elbow = 3 equivalent feet
Horizontal Pipe Run = 1 equivalent foot per
actual foot
Vertical Pipe Run = 0.5 equivalent foot
per actual foot
NOTE: At altitudes above 3,000 feet, we suggest
the use of 4” diameter vent at an EVL of 7 feet or
more.
INSTALLATION
A. HORIZONTALLY THROUGH WALL (refer to Figure
5)
NOTE: Follow L-Vent chimney manufacturer’s
instructions.
1. Positions stove, adhering to clearances shown
in Figure 1.
2. Locate position of hole in wall; directly behind
stove exhaust vent (refer to gure 3).
3. Always maintain 3” clearance from
combustible materials.
4. Install L-Vent wall thimble per L-Vent
manufacturer’s instructions.
Attach enough piping to penetrate and extend
at least 6” beyond exterior walls. An 8-foot vertical
pipe run is suggested where possible to reduce the
possibility of smoke spillage in the event of a loss of
negative pressure.
5. Attach cap and seal outside wall thimbles with
non- hardening waterproof mastic.
6. Terminations should not be located so that
hot exhaust gases can ignite trees, shrubs, or
grass 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 1 foot
above any door, window or gravity air inlet into any
building; c) not less than 2 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.
FIGURE 5
WALL
THIMBLE
6” MINIMUM CLEARANCE
TO ANY COMBUSTIBLE
SURFACE
CLEAN-OUT TEE
A 90 DEGREE ELBOW
MAY ALSO BE USED
L-VENT
ADAPTER
WALL STRAP
SEE VENT MANUFACTURER
FOR NUMBER AND SPACING
Installation
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