DVB Series Direct Vent Gas Fireplace
54D0701
25
VeNt INstAllAtIoN
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 Page 23, Figure 28. 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 roof-
ing 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 require-
ments.
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.
cAtheDRAl ceIlING INstAllAtIoN
1. Remove shingles or other roof covering as necessary
to cut the rectangular hole for the support box. Mark the outline of the cathedral ceil-
ing support box on the roof sheathing using the locating hole as a center point.
2. Cut the hole 1/8" larger than the support box outline.
Figure 32
3. Lower the support box through the hole in the roof until the bottom of the box extends
at least 2" below the ceiling.
Figure 32.
Align the support box vertically and horizontally
using a level. Temporarily tack the support box in place through the inside walls and
into the roof sheeting.
4. Using tin snips, cut the support box from the top corners down to the roof line and fold
the resulting flaps over the roof sheeting.
Figure 33.
Apply a bead of non-hardening,
mastic around the top edges of the support box to make a seal between the box and
the roof. Nail in place with roofing nails. Remove any combustible material that might
be inside the support box.
5. Complete the cathedral ceiling installation by following the same procedures outlines in steps
2 through 6 for Flat Ceiling Installation.
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 33 -
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
