MHSC DIRECT VENT MLDV500 Installation And Operating Instructions Manual page 25

VENTING INSTALLATION
INSTALLATION FOR VERTICAL TERMINATION - FLAT CEILING INSTALLATION (continued)
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 materi-
als.
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.
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.
Termination
Vent
Storm Collar
Flashing
Concentric
Vent Pipe
75D0004
Horizontal Overhang
2 ft.
2 ft. Min.
Min.
1" Minimum Clearance to
Combustibles
Figure 35 -
Minimum Chimney Clearance
FP1971
Min chimney clearance
Vertical Wall
Lowest
Discharge
Opening
12
H*
X
MLDV Series Gas Fireplace
ROOF PITCH
Flat to 6/1
Over 6/1 to 7/1
Over 7/1 to 8/1
Over 8/1 to 9/1
Over 9/1 to 10/1
Over 10/1 to 11/1
Over 11/1 to 1/1
*H = Minimum height from roof to lowest
discharge oopening of vent.
FP1971
H (feet)
1.0
1.5
1.5
.0
.5
3.5
4.0
5