20
20303735
VWDV70 Series Gas Fireplace
VentInG InstaLLatIon
InstaLLatIon For VertIcaL terMInatIon
1. Determine the route your vertical venting will take. If
ceiling joist, roof rafters or other framing will obstruct
the venting system, consider an offset.
Refer to Figure
26
to avoid cutting load bearing members.
For optimal flame appearance on straight vertical runs of
10 feet (3 m) or higher, the two (2) restrictor sliding plates
on the inside roof of the firebox should be partially closed.
Use the following guidelines as a starting point:
height of Venting
restrictor plate setting
30' to 40' (9.1 to 12.2 m)
1/4 open
20' to 30' (6.1 to 9.1 m)
1/3 open
10' to 20' (3 to 6.1 m)
1/2 open
After initially setting the plate openings, replace glass door
and operate fireplace for at least 15 minutes to observe
the flames.
For natural gas, the average flame height should be
approximately 6" to 7" (152 to 178 mm).
For LP gas, the average flame height should be approxi-
mately 4" to 5" (102 to 127 mm).
If the flames are too tall, open plates slightly.
If the flames are too short, close plates slightly.
cautIon:
Allow fireplace to cool completely before touch-
ing or opening the glass door.
•
Runs may not incorporate elbows.
note:
Pay special attention to these installation instructions
for required clearances (air space) to combustibles when
passing through ceilings, walls, roofs, enclosures, attic
rafters, etc. Do not pack air spaces with insulation. Also
note maximum vertical rise of the venting system and any
maximum horizontal offset limitations. Offsets must fall
within the parameters shown in
Figures 25 and 26
.
2. Set fireplace in desired location. Drop a line plumb down
from the ceiling to the position of the flue exit. Mark the
center point where the vent will penetrate the ceiling.
Drill a small locating hole a this point.
Drop a plumb line from the inside of the roof to the ceiling
locating hole in the ceiling. Mark the center point where
the vent will penetrate the roof. Drill a small locating hole
at this point.
FP1969
offset w/ wallstrap
Figure 26 -
Offset with Wall Strap and 45° Elbows
Roof Flashing
Wall Strap
45° Elbows
Ceiling Firestop
FP1669
FP1969
firestop w room above
10
1
/
2
"
10
1
/
2
"
FP1970
firestop no room
Figure 27 - If Area Above is a Room, Install Firestop
above Framed Hole as Shown
Figure 28 - If Area Above is Not a Room, Install
Firestop above Framed Hole as Shown
Firestop
Nails
Nails
Firestop
FP1970
