Vermont Castings WDV500NTSC Installation And Operating Instructions Manual page 19

VentInG InstallatIOn
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 10Z\x"x10Z\x" (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. Figure 22. Whenever
possible, use 45° elbows instead of 90° elbows. the
45° elbow offers less restriction to the flow of the flue
gases and intake air.
5. Place the flashing over the pipe section(s) extending
through the roof. Secure the base of the flashing to
the roof and framing with roofing nails. Be sure roofing
material overlaps the top edge of the flashing. 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 first floor, 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 fill any of the
required clearance spaces with insulation.
78D0011
terMInatIOn heIGhts FOr Vents aBOVe Flat Or
slOpeD rOOFs
Horizontal Overhang
2 ft.
Min.
Termination
Vent
Storm
Collar
Flashing
Concentric
Vent Pipe
FP1971
Min chimney clearance
WDV Series Gas Fireplace
Vertical Wall
2 ft. Min.
Lowest
Discharge
Opening
H*
X
1" Minimum
Clearances to
Combustibles
Figure 25 -
Minimum Chimney Clearance
roof pitch h (feet)
Flat to 6/12
Over 6/12 to 7/12 1.25
Over 7/12 to 8/12
Over 8/12 to 9/12
Over 9/12 to 10/12
Over 10/12 to 11/12 3.25
Over 11/12 to 12/12
*H - Minimum height from roof to
lowest discharge opening of vent
12
FP1971
1.0
1.5
2.0
2.5
4.0
19