Page 10
Vista 42 ST See-thru Gas Fireplace
rev.110404
Installation
Installation of Vertical Vent
Vertical terminations must be installed:
•
minimum 2' (two feet) above the highest point where
vent passes through the roof.
•
minimum 6' (six feet) from a mechanical air inlet
•
minimum 18" (11/2 feet) from a parapet wall.
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".
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.
Example:
Typical vent installation.
30' vertical vent
2 - 2' offsets required
25% of 30' = 7-1/2' max. offset allowed
This venting configuration meets requirements.
A - Termination
PVTK-1
B - Flex sections
PFL-1 (12" section)
PFL-2 (24" section)
PFL-3 (36" section)
PFL-4 (48" section)
C - Solid sections
PEXT-1 (12" section)
PEXT-2 (24" section)
PEXT-3 (36" section)
PEXT-4 (48" section)
D - Support Ring and Plate
PSPXT-7 (8" dia.)
E - Firestop
PS-8 (8" dia.)
F - Roof Flashing
PRF-7 (1/12 - 7/12 pitch)
PRF-12 (7/12 - 12/12 pt.)
Figure 18.
Vertical venting using 2 offsets (1 offset= two 90° bends).
Figure 17.
Vertical venting using 1 offset (1 offset= two 90° bends)
Figure 16.
Straight, vertical venting.
32’ max
32’ max
32’ max
