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24
75D2525
DVM Series Direct Vent Gas Fireplace
Figure 33 -
If area above is a room, install restop above framed
hole as shown
Firestop
Nails
FP1969
If an offset is needed to avoid obstructions, you
must support the vent pipe every three (3) feet. Use wall
straps for this purpose. Page 23, Figure 32. Whenever
possible, use 45° elbows instead of 90° elbows. The 45°
elbow offers less restriction to the ow of the ue gases
and intake air.
5. Place the ashing over the pipe section(s) extending
through the roof. Secure the base of the ashing to
the roof and framing with roong nails. Be sure roong
material overlaps the top edge of the 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 requirements as shown
in Figure 35.
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 rst 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 ll any of the required clearance spaces with
insulation.
2 ft.
Min.
2 ft. Min.
X
12
H*
Termination
Vent
Storm
Collar
Flashing
Lowest
Discharge
Opening
Concentric
Vent Pipe
1” Minimum Clearance to
Combustibles
FP1971
Horizontal Overhang
Figure 35 -
Minimum Chimney Clearance
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
Figure 34 -
If area above is not a room, install restop below
framed hole as shown
Nails
Firestop
1056O”
1056O”
956O”
956O”
FP1970
4 x 6B\,
Venting
5 x 8
Venting
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