20
75D2523
MDV Series Direct Vent Gas Fireplace
VentIng InstallatIon
example:
Elbow 1 = 90°
Elbow 2 = 45°
Elbow 3 = 45°
Elbow 4 = 90°
Total Angular Variation = 270°
Figure 24 -
Maximum Elbow Usage
1
2
3
4
1
2
3
4
1 + 2 + 3 + 4 = 270°
•
For each 45° elbow installed in the horizontal run, the
length of the horizontal run MUST be reduced by 18"
(457 mm). This does not apply if the 45° elbows are
installed on the vertical part of the vent system.
•
The maximum number of elbow degrees in a system is
270°.
Figure 24
horIZontal wIth VertIcal rIse
(through-the-wall) applIcatIons
1. Locate and cut the vent opening in the wall. For com-
bustible walls first frame in opening.
combustible Interior walls:
Cut a 12
Z\x
"H x 10
Z\x
" W
(318 x 267 mm) hole through the interior wall.
combustible exterior walls:
Cut a 10
Z\x
"H x 10
Z\x
"
W (267 x 267 mm) square hole through the exterior
wall frame.
Figure 25
noncombustible walls:
Hole opening should be 8
Z\x
"
(216 mm) in diameter.
2. The center of the hole should align with the center line
of the horizontal rigid vent pipe end. Allow 1/4" minimum
rise per foot.
Figure 25
w
arn
Ing
you may use a reducer from 5"x8" to
4"x6
B\,
" or 4"x7" for horizontal with vertical
rise applications. only use framing
instructions below when using 4"x6
B\,
" or
4"x7" venting.
If the reducer is installed at the rear of the
unit, you must immediately follow with a 90°
elbow for a vertical rise before continuing
with any horizontal run. there is a minimum
total height of 7 feet from the fireplace floor
to the last section of pipe before horizontal
run. refer to graph on page 16.
1. Locate and cut the vent opening in the wall. For com-
bustible walls first frame in opening.
combustible Interior walls:
Cut a 11
Z\x
"H x 9
Z\x
" W
(292 x 241 mm) hole through the interior wall.
combustible exterior walls:
Cut a 9
Z\x
"H x 9
Z\x
"W (241
x 241 mm) square hole through the exterior wall frame.
Figure 26
noncombustible walls:
Hole opening should be 7
Z\x
"
(190 mm) in diameter.
2. The center of the hole should align with the center line
of the horizontal rigid vent pipe end. Allow 1/4" minimum
rise per foot.
Figure 26
Figure 25 -
Exterior Wall Framing Dimensions
VO584-100
Vent Opening
2/99 djt
10
Z\x
"
(267 mm)
10
Z\x
"
(267 mm)
combustible wall
framing
VO584-100
8
Z\x
"
(216 mm)
