Grand Bay 40 Direct Vent Freestanding
Page 25
January 2000
VERTICAL TERMINATIONS
USING GS SERIES PIPE
Step 1.
Check the installation instructions for required clearances (air space) to combustibles
when passing through ceilings, walls, roofs, enclosures, attic rafters, or other nearby
combustible surfaces. Do not pack air space with insulation. Check the instructions for
maximum vertical rise of the venting system, and any maximum horizontal offset limitations
(Figure 11). All offsets fall within the set parameters of the vent graph located on page 20.
NOTE
: Maximum vertical rise allowable is 30 (9144mm) (Figure 11).
NOTE
: Maximum number of 45° elbows permitted for a vertical installation is four (4). Does not
decrease maximum vertical rise.
Step 2
. Set the gas stove in its desired location. Drop a plumb bob down from the ceiling to the
position of the stove flue exit, and mark the location where the vent will penetrate the
ceiling. Drill a small hole at this point. Next, drop a plumb bob from the roof to the hole
previously drilled in the ceiling, and mark the spot where the vent will penetrate the roof.
Determine if ceiling joists, roof rafters, or other framing will obstruct the venting system.
You may wish to relocate the stove, or to offset, as shown in Figure 12, to avoid cutting
loadbearing members.
Step 3.
To install the round support box/wall thimble in a flat ceiling, cut a 10 (254mm) square
hole in the ceiling, centered on the hole drilled in Step 2. Frame the hole as shown in
Figure 13.
FIG. 13
FIG. 11
FIG. 12
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DuraVent #991
VENTING:
VER
TICAL
TERMINA
TIONS