20306745
21
VWDV70 Series Gas Fireplace
VENTING INSTALLATION
2 ft.
Min.
2 ft. Min.
X
12
H*
Horizontal Overhang
Termination
Vent
Lowest
Discharge
Opening
Storm
Collar
Flashing
Concentric
Vent Pipe
1" Minimum
Clearances to
Combustibles
Vertical Wall
FP1971
Figure 29 -
Minimum Chimney Clearance
Roof Pitch
H (feet)
Flat to 6/12
1.0
Over 6/12 to 7/12
1.25
Over 7/12 to 8/12
1.5
Over 8/12 to 9/12
2.0
Over 9/12 to 10/12
2.5
Over 10/12 to 11/12
3.25
Over 11/12 to 12/12
4.0
*H - Minimum height from roof to lowest discharge opening of vent
TERMINATION HEIGHTS FOR VENTS ABOVE
FLAT OR SLOPED ROOFS
2. Assemble the desired lengths of pipe and elbows nec-
essary to reach from the burner system
fl
ue up through
the
fi
restop. Be sure pipe and elbow connections are
fully twist-locked.
3. Cut a hole in the roof using the locating hole as a center
point. (Cover any exposed open vent pipes before
cutting hole in roof). The 10
1
⁄
2
" x 10
1
⁄
2
" (241 x 241 mm)
hole must be measured on the horizontal. Actual length
may be larger depending on the pitch of the roof. There
must be a 1" minimum clearance from the vent pipe to
combustible materials. (Insulation should be considered
a combustible material).
4. Connect a section of pipe and extend up through the
hole.
NOTE: If an offset is needed to avoid obstructions, you
must support the vent pipe every three (3) feet. Use wall
straps for this purpose. Refer to Figure 24. Whenever
possible, use 45° elbows instead of 90° elbows. The
45° elbow offers less restriction to the fl ow of the fl ue
gases and intake air.
5. Place the
fl
ashing over the pipe section(s) extending
through the roof. Secure the base of the
fl
ashing to
the roof and framing with roo
fi
ng nails. Be sure roo
fi
ng
material overlaps the top edge of the
fl
ashing. There
must be a 1" clearance from the vent pipe to combustible
materials.
6. Continue to add pipe sections until the height of the vent
cap meets the minimum building code requirements.
NOTE: You must increase vent height for steep roof
pitches. Nearby trees, adjoining roof lines, steep
pitched roofs, and other similar factors may cause
poor draft or down-drafting in high winds. Increasing
the vent height may solve this problem.
NOTE: If the vent pipe passes through any occupied
areas above the fi rst fl oor, including storage spaces
and closets, you must enclose pipe. You may frame and
sheetrock the enclosure with standard construction
material. Make sure to meet the minimum allowable
clearances to combustibles. Do not fi ll any of the
required clearance spaces with insulation.
