Majestic 300DVB, Инструкция по установке и эксплуатации, Страница: 25 / 52

54D0701
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TERMINATION hEIGhT TABLE
Use this table to determine the minimum height above the roof.
Minimum Height
Roof Pitch Feet Meters
Flat to 7/12 1 0.3
Over 7/12 to 8/12 1.5 0.46
Over 8/12 to 9/12 2 0.61
Over 9/12 to 10/12 2.5 0.76
Over 10/12 to 11/12 3.25 0.99
Over 11/12 to 12/12 4 1.22
Over 12/12 to 14/12 5 1.52
Figure 35 - Minimum Chimney Clearance
H
X
12"
Termination
Storm collar
Cone flashing
VENT 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 9 1 /
2
"x9 1/2 " (241mm x 241mm) 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. See Figure 28, page 23. 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.
CAThEDRAL CEILING INSTALLATION
1. Remove shingles or other roof covering as necessary to cut the rectan -
gular hole for the support box. Mark the outline of the cathedral ceiling
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. See 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.
See 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. See
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, page
24 and above.