Rear Wall Vent Installation - MHSC DIRECT VENT MLDV500 Installation And Operating Instructions Manual

MLDV Series Gas Fireplace
REAR WALL VENT INSTALLATION (5" x 8" VENTING
ONLY)
When installed as a rear vent unit, this appliance may be vented directly to
a termination located on the rear wall behind the appliance. Only an MHSC
brand termination is allowed for this application.
•
The maximum horizontal distance between the rear of the appliance
and the termination is 0" (508 mm). Figure 14
Maximum
0"
Top View Flat Installation
Figure 14 - Rear Vent Application,
DVR584-600
Maximum Horizontal Distance
Rear vent no elbows
•
Only one 45 degree elbow is allowed in these installations.
2/99 djt
1. Rigid vent pipes and fittings have special twist-lock connections. Assemble the desired
combination of pipe and elbows to the appliance adapter.
Twist-Lock Procedure: The female ends of the pipes and fittings have three (3) locking
lugs (indentations). These lugs will slide straight into matching slots on the male end of
adjacent pipes and fittings. Push the pipe sections together and twist one section clockwise
approximately one-quarter turn until the sections are fully locked. Figure 15
. Refer to venting and termination instructions for further instructions.
3. Locate and cut the vent opening in the
wall. For combustible walls first frame in
opening.
Combustible Interior Walls: Cut a 1
1
x 10 / " hole through the interior wall.

Combustible Exterior Walls: Cut a 10
1
x 10 / " square hole through the exterior

wall frame. Figure 16
Noncombustible Walls: Hole opening
1
should be 8 / " (16 mm) in diameter.

4. 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 16
5. Apply a bead of non-hardening mastic
around the outside edge of vent cap. Posi-
tion the vent cap in the center of hole on the
exterior wall with the word "UP" on the vent
cap facing up. Insure proper clearance of
1" to combustibles is maintained. Attach
the vent cap with four (4) wood screws
supplied. Figure 17
16
(67 mm)
1
/ "

1
/ "

Combustible Wall
10 1 / "

(67 mm)
1
8 / "
Noncombustible

(16 mm)
FP1954
wall framing
VENTING INSTALLATION
Figure 15 -
Rigid Vent Pipe Connections
FP1953
rigid pipe
1
10 / "

Wall
Figure 16 -
Exterior Wall Framing Dimensions
Female Locking
Lugs
NOTE: Horizontal runs of
vent must be supported every
three feet (914 mm). Use wall
straps for this purpose.
Male Slots
FP1954
75D0004