Monessen Hearth HDV500NV/PV - Manual (Page 24)

HDV Series Direct Vent Gas Fireplace
4 56D3048
VeNtING INStAllAtIoN
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. See Figure 33, page 6. 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 combus-
tible materials.
6. Continue to add pipe sections until the height of the
vent cap meets the minimum requirements below.
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.
FP1969
firestop w room above
Figure 33 -
If area above is a room, install firestop above framed
hole as shown
Firestop
Nails
FP1969
10
56O"
10
56O"
FP1970
firestop no room
956O
"
956O
"
Figure 34 -
If area above is not a room, install firestop below
framed hole as shown
Nails
Firestop
FP1970
4 x 6B\,
Venting
5 x 8
Venting
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.
2 ft.
Min.
2 ft. Min.
X
12
H*
FP1971
Min chimney clearance
Termination
Vent
Storm
Collar
Flashing
Lowest
Discharge
Opening
Concentric
Vent Pipe
1” Minimum Clearance to
Combustibles
FP1971
Horizontal Overhang
Figure 35 -
Minimum Chimney Clearance
H
Roof Pitch Feet Meters
Flat to 7/1 1.0 .3
Over 7/1 to 8/1 1.5 .46
Over 8/1 to 9/1 .0 .61
Over 9/1 to 10/1 .5 .76
Over 10/1 to 11/1 3.5 .99
Over 11/1 to 1/1 4.0 1.
Over 1/1 to 14/1 5 1.5
*H - Minimum height from roof to
lowest discharge opening of vent