20
20306748
MLDV Series Gas Fireplace
VENTING INSTALLATION
VERTICAL THROUGH-THE-ROOF APPLICA-
TIONS
Install restrictor disc as shown in
Figure 29
for vertically
vented applications.
Up to two (2) restrictor discs may be needed for 40' in-
stallation.
The two (2) restrictor discs suppled will work for most instal-
lations. If a third disc is needed order Part No. 56D3027.
You may use a reducer to 4" x 6
5
⁄
8
" or 4" x 7" in vertically
vented applications. If a reducer is used, only one restrictor
may be used.
NOTICE
A restrictor disc must be installed on any
vertical termination that is higher than 12'.
Restrictor Disc
Fireplace Collar
Figure 29 -
Install Restrictor Disc into Fireplace Collar
This Gas Fireplace has been approved for,
•
Vertical installations up to 40' (12 m) in height. Up to
a 10' (3 m) horizontal vent run can be installed within
the vent system using a maximum of two 90° elbows.
Figure 30
10' (3 m)
Maximum
10' (3 m)
Maximum
Maximum Height
40' (12 m)
Minimum Height
8' (2 m)
Support Straps
Every 3' (914 mm)
Figure 30 -
Support Straps for Horizontal Runs
Maximum Height
40' (12 m)
Minimum Height
8' (2 m)
Support Straps
Every 3' (914 mm)
FP1183
•
Up to two 45° elbows may be used within the horizontal
run. For each 45° elbow used on the horizontal plane,
the maximum horizontal length must be reduced by 18"
(450 mm).
Example:
Maximum horizontal length
No elbows
= 10’ (3 m)
1 x 45° elbows
= 8.5’ (2.6 m)
2 x 45° elbows
= 7’ (2.1 m)
•
A minimum of an 8' (2.5 m) vertical rise is required.
