Page 12
Vista 38 ST See-thru Gas Fireplace
rev.110331
Installation
Long Vent Runs:
For longer or more complex vent runs, vertical lift is required. First ensure that the
planned run is acceptable using the Vent Graph. Plan out the required components
using the charts on pages 8 and 11.
Figure 21.
Heat shield for short horizontal installation. Install by sliding over the vent
pipe where it connects to the termination.
Example:
A 10' section of rigid pipe and a 90° elbow may be used in conjunction with a 3 ft.
flex section (PFL-3) will, when extended in a chase, allow for a maximum horizon-
tal run of 12'6" from the center of the fireplace to outside wall and a minimum of
7'6" when retracted in opposite direction.
See
Figure 22
.
"D" flex sections and "E" solid sections may be used in conjunction with one an-
other to obtain different possible horizontal length installations.
NOTE:
Flex section
must not exceed maximum horizontal length of 3 feet and for this application the
top clearance is to the ceiling.
RHS8
Figure 22
. Extended horizontal installation using a combination of rigid and flex
venting.
Vertical Vent Installations
•
Maximum vent height is 30 feet above fireplace.
Note: Flame characteristics will change if the maximum vent height is used.
•
Minimum
clearance to combustible construction around the vent pipe is
1"
on all sides must be maintained, except on horizontal venting where the
top
of the pipe must have a clearance of at least 2".
1. Straight Vertical Installation
Figure 23
. Straight, vertical venting.
PEXT
Solid Sectio
n
2. Offset Vertical Installations
•
A maximum of two offsets
(each offset has two 90° bends)
may be made if
the length of the offsets does not exceed 25% of the vertical vent height, when
measured center to center of piping.
Using this vent installation example:
• 30' vertical vent
• 2 - 2' offsets required
Maximum offset allowed = 25% of 30'or 71/2'.
This venting configuration meets requirements.
Heat Shields
Due to high flue temperatures, the heat shield (RHS101) must be used on
all in-
stallations straight through the wall
, at the point where the vent pipe connects
to the termination. With the heat shield, vent clearances can be maintained at 1".
The heat shield is not included with the fireplace.
To install the heat shield, slide one section over the vent pipe on the inside of the
wall opening, with the circular portion
inside the wall cavity
. Screw the shield in
place over the wall opening. Install the second section on the outside of the wall
opening sliding the circular portion into the wall opening. Refer to
Figure 21
.
