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VENTING
INSTALLATION
Continued
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 23). 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 sheathing.
4. Using tin snips, cut the support box from
the top corners down to the roofline and
fold the resulting flaps over the roof
sheathing (see Figure 24). 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 in-
side of the support box.
5. Complete the cathedral ceiling instal-
lation by following the same proce-
dures outlined in steps 2 through 7 for
Flat Ceiling Installation, page 12 .
Level
Cathedral ceiling
support box
2" minimum below
Cut hole 1/8" larger than support
box when projected onto roofline
Figure 23 - Cathedral Ceiling Support
Box Installation
Non-hardening Mastic under all
edges of support box before nailing
Figure 24 - Installed Cathedral Ceiling
Support Box
105982
Vertical Termination Configurations
Figures 25 through 28 show four different configurations for vertical termination. All
connections must be sealed with high temperature silicone sealant as specified in the second
warning statement on page 7.
Figure 25 - Vertical Rigid Venting Configuration Using Two 90 Elbows with Two
Horizontal Runs
finished ceiling
Figure 26 - Vertical Rigid Venting Configuration Using One 90 Elbow
OWNER'S MANUAL
Venting with Two 90 Elbows
Vertical (V)
5' min.
6' min.
7' min.
8' min.
20' max.
Note: Restrictor must be
installed in all vertical
installations.
13
Horizontal (H
) +
1
Horizontal (H
)
2
2' max.
4' max.
6' max.
8' max.
8' max.
Note: Restrictor must be
installed in all vertical
installations.
Venting with One 90 Elbow
Vertical (V)
Horizontal (H)
5' min.
2' max.
6' min.
4' max.
7' min.
6' max.
8' min.
8' max.
20' max.
8' max.
Continued
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