United States Stove Company 5040 - Manual (Page 9)

7 INSTALLATION
Equivalent Vent Length (EVL)
The longer the run of pipe in your installation (both with inserts
and freestandings), the more restriction 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 feet of EVL.
• It is recommended that vertical runs be a minimum of 8
feet.
• To calculate EVL, use the following conversions:
90º elbow or “T” = 5 equivalent feet
45º 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.
B. HORIZONTALLY THROUGH WALL (refer to Figure 9)
NOTE: Follow L-Vent chimney manufacturer’s instructions.
1. Position stove, adhering to clearances shown in Figures
1 & 2.
2. Locate position of hole in wall; directly behind stove
exhaust vent (refer to figure 5).
3. Always maintain 3” clearance from combustible materials.
4. Install L-Vent wall thimble per L-Vent manufacturer’s
instructions.
5. Attach enough piping to penetrate and extend at least 6”
beyond exterior walls. An 8-foot vertical pipe run is sug-
gested where possible to reduce the possibility of smoke
spillage in the event of a loss of negative pressure.
6. Attach cap and seal outside wall thimbles with non-
hardening waterproof mastic.
7. 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 in-
stallations must use a spark arrester.
FIGURE 8
FIGURE 9
VERTICAL ROOF VENT
WALL
THIMBLE
6” MINIMUM CLEARANCE
TO ANY COMBUSTIBLE
SURFACE
CLEAN-OUT TEE
A 90 DEGREE ELBOW
MAY ALSO BE USED
WALL STRAP
SEE VENT MANUFACTURER
FOR NUMBER AND SPACING
TO
APPLIANCE
L-VENT
ADAPTER
6” MINIMUM CLEARANCE