Equivalent Vent Length (Evl) - Drolet ECO-65 Owner's Manual

DO NOT CONNECT THIS UNIT TO A CHIMNEY FLUE SERVING ANOTHER APPLIANCE.
DO NOT INSTALL A FLUE DAMPER IN THE EXHAUST VENTING SYSTEM OF THIS UNIT.
WARNING: INSTALL VENT AT CLEARANCES SPECIFIED BY THE VENT MANUFACTURER.
WARNING: DO NOT INSTALL IN BEDROOM
CAUTION: THE STRUCTURAL INTEGRITY OF THE MANUFACTURED HOME FLOOR, WALL, AND
CEILING/ROOF MUST BE MAINTAINED
CAUTION: THE CHIMNEY CONNECTOR SHALL NOT PASS TROUGH AN ATTIC OR ROOF SPACE,
CLOSET OR SIMILAR CONCEALED SPACE, OR A FLOOR, OR CEILING.

1.6.1. Equivalent Vent Length (EVL)

The longer the run of pipe in your installation, the
greater the restriction in your system.
Always use 4" pipe
Horizontal runs shall not exceed 9 feet.
Never exceed 30 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
Here is an example on how to calculate the EVL of
your installation. (See Figure 10):
(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.
Note: Do not include the exterior wall termination (swan neck) in the
calculation of the EVL.
EVL equivalent(ft)
5
3
1
0.5
FIGURE 10
Venting through wall