Desa CD36TN-M - Manual (Page 16)

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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 roof-
ing nails. Be sure roofing material overlaps the
top edge of the flashing as shown in Figure 19,
page 15. 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 described in Figure 9 on page 9.
Note: You must increase vent height for steep roof
pitches. Nearby trees, adjoining rooflines, steep
pitched roofs and other similar factors may cause
poor draft or down-drafting in high winds. Increas-
ing the vent height may solve this problem.
7. Twist-lock the vent cap onto the last section
of vent pipe.
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 construc-
tion material. Make sure and meet the minimum
allowable clearances to combustibles. Do not fill
any of the required air spaces with insulation.
Thimble Installation
1. Plumb and locate knockout area for vent pipe.
2. Cut and frame ceiling joist to dimensions
shown in Figure 11, page 11.
3. Determine where firestop plate should be at-
tached to thimble by test-fitting thimble into
framing. Thimble should be at or above the
height of the insulation.
4. Attach thimble into firestop plate using 4 hex
screws provided (see Figure 21).
VENTING INSTALLATION
INSTRUCTIONS
Continued
Figure 22 - Vertical Venting
Configuration using Three 90° Elbows
(Vertical Round High Wind Termination)
Venting with Three 90° Elbows
Vertical (V)
Horizontal (H
1
) +
Horizontal (H
2
)
8' Min. 5' Max
10' Min. 8' Max
1' Min. 11' Max
14' Min. 14' Max
1' Min. 1' Max
18' Min. 0' Max
40' Min. 0' Max
90° Elbow
Note: Install a
VR-58 vertical
restrictor ring
into inner pipe
section prior to
attaching vent
termination
cap.
Framing
Top of
Thimble
Should
Measure
to Top of
Insullation
Hex Screw
to Attach
Firestop to
Thimble
Phillips Screws
to Attach
Firestop to
Framed Hole
Firestop
Figure 21 - Installing Thimble with
Firestop
5. Refit assembly into opening and attach to
framing with 8 phillips screws provided (see
Figure 20, page 15).
6. Thimble installation is ready to receive vent
pipe. Follow venting installation instructions.
Vertical Termination Configurations for
Top Vent
Figures 22 through 25 show four different con-
figurations for vertical termination.
VERTICAL VENT INSTALLATIONS USING
MULTIPLE 90° ELBOWS