Monessen Hearth Direct Vent Gas Fireplace MDV500 - Manual (Page 22)

22 75D2523
10 1 /
2
"
(267mm)
10
1
/ 2 "
(267mm)
8 1 /
2
"
(216mm)
Combustible
Wall
Noncombustible
Wall
9 1 /
2
"
(241mm)
9 1 /
2
"
(241mm)
3 3 /
4
"
(92mm)
7 1 /
2
"
(190mm)
VENT INSTALLATION
1. Locate and cut the vent opening in the wall.
For combustible walls first frame in opening.
Combustible Interior Walls: Cut a 12 1 /
2
"H x
10 1 /
2
" W hole through the interior wall.
Combustible Exterior Walls: Cut a 10 1 /
2
"H
x 10 1 /
2
"W square hole through the exterior
wall frame. See Figure 17.
Noncombustible Walls: Hole opening should
be 8 1 /
2
" (216mm) in diameter.
2. The center of the hole should line up with the
center line of the horizontal rigid vent pipe
end. Allow
1 /
4
" minimum rise per foot. See
Figure 26.
Figure 26 - Exterior Wall Framing Dimensions for 5"x8"
WARNING
You may use a reducer from 5"x8"
to 4"x6
5 /
8
" for horizontal with
vertical rise applications. ONLY
use framing instructions below
when using 4"x6
5 /
8
" 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. Refer to graph
on page 17.
1. Locate and cut the vent opening in the wall.
For combustible walls first frame in opening.
Combustible Interior Walls: Cut a 11 1 /
2
"H x
9 1 /
2
" W hole through the interior wall.
Combustible Exterior Walls: Cut a 9 1 /
2
"H
x 9 1 /
2
"W square hole through the exterior
wall frame. See Figure 16.
Noncombustible Walls: Hole opening should
be 7 1 /
2
" (190mm) in diameter.
2. The center of the hole should line up with the
center line of the horizontal rigid vent pipe
end. Allow
1 /
4
" minimum rise per foot. See
Figure 27. Figure 27 - Exterior Wall Framing Dimensions
for 4"x6 5 /
8
"
HORIZONTAL WITH VERTICAL RISE (THROUGH-THE-WALL) APPLICATIONS
NOTE: #1222DA reducer must be used when 4x6 5 /
8
" venting
is preferred. Reducer must be installed directly onto
unit at pipe adaptor before vertical rise.