Enviro C-10791 - Manual (Page 18)

Figure 23. Possible Vent Configurations for Top Vented; Vertical
and Horizontal Terminations.
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Figure 24. Possible Vent Restrictor Positions.
Initial Installation
QUALIFIED INSTALLERS ONLY
V
ENT
C
ONFIGURATIONS AND
R
ESTRICTOR
S
ETTINGS
:
Figures 23 shows the range of venting options, it shows possible vent configurations if the unit is top
vented, for vertical and horizontal terminations, any layout that remains within the shaded area is
acceptable. Having the fewest number of elbows is ideal, as they tend to disrupt air movement. Using
45˚ elbows is preferable to using 90˚ elbows. Also, a shorter vent system will perform better than a
longer one.
The vent restrictor controls the amount of air moving through the vent pipe. Longer vertical vent lengths
necessitate greater restriction; position 1 is open and position 5 is maximum restriction. Figure 23
NOTE: The total length of the vent pipes can
not exceed 32 feet (15.12 m). Any combination
of rise and run can be used as long as it lays
within the shaded area (a total of three (3) 90°
elbows or six (6) 45° elbows can be used).
In addition to what is shown, if a 90°
elbow is used in the horizontal plane,
3 feet (91.4 cm) must be subtracted
from the allowable horizontal run
(for each 45° elbow, 11⁄2 feet
must be subtracted from the
allowable horizontal run).
shows the vent restrictor position required,
relative to the length of vent pipe. The vent
restrictor is located in the center of the
fireplace, above the glass. Figure 24 shows
the vent restrictor dial and the holes that
indicate the different levels. To avoid injury,
it is best to make this adjustment when the
fireplace is cool or use welder’s gloves or
oven mitts.
Note: 0,0 in Figure 23 represents a 90˚
bend directly off the outlet of the unit, 413⁄4
inches (106 cm) from floor, in all horizontal
instances except when using Selkirk and
having less than a 4 feet (1.22 m) rise and
8 feet (2.44 m) horizontal offset. In this
case, a 1 foot (30.5 cm) rise must be added
below the 90˚ bend.
Note for rear vented: At 293⁄8 inches (75
cm) up, the maximum horizontal rear exit
vent length is 17 inches (43 cm) with a 45°
elbow (see Figure 12).
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