www.desatech.com
118531-01C
16
5. Place flashing over pipe section(s) extend
-
ing through roof. Secure base of flashing
to roof and framing with roofing nails. Be
sure roofing material overlaps top edge of
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 height of
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. Increasing vent height may solve this
problem
.
7. Twist-lock vent cap onto last section of
vent pipe.
Note
:
If 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
and meet the minimum allowable clearances
to combustibles. Do not fill any of 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
attached to thimble by test-fitting thimble
into framing. Thimble should be at or above
height of insulation.
VENTING INSTALLATION
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
12' Min.
11' Max
14' Min.
14' Max
16' Min.
17' Max
18' Min.
20' Max
40' Min.
20' 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
4. Attach thimble into firestop plate using 4
hex screws provided (see Figure 21).
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
configurations for vertical termination.
VERTICAL VENT INSTALLATIONS USING
MULTIPLE 90° ELBOWS
