107304
For more information, visit www.desatech.com
For more information, visit www.desatech.com
17
17
Vertical Termination Configurations
Figure 36 through 39 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 12.
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.
Figure 36 - Vertical Venting Configuration Using One 90
°
Elbow
Note: Install restrictor
into 4" collar of burner
system as shown.
VENTING INSTALLATION
Continued
Figure 34 - Cathedral Ceiling Support Box Installation
Non-hardening Mastic
under all edges of support
box before nailing
Figure 35 - Installed Cathedral Ceiling Support Box
Cut hole 1/8" larger than support
box when projected onto roofline
2" minimum below
finished ceiling
Cathedral ceiling
support box
Level
7.
Twist-lock the vent cap onto the last section of vent pipe and
seal outer pipe connection with high temperature silicone seal-
ant as specified in the second warning statement on page 12.
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 and meet the minimum allowable clearances to
combustibles. Do not fill any of the required air 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 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 34).
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 34). 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 sheath-
ing (see Figure 35). 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 com-
bustible material that might be inside of the support box.
5.
Complete the cathedral ceiling installation by following the same
procedures outlined in steps 2 through 7 for Flat Ceiling Instal-
lation, page 16
.
VENTING INSTALLATION
Installation for Vertical Termination (Cont.)
PA-47
