Desa CDVBNC, CDVBPC Cathedral Ceiling Installation, Vertical Termination Configurations

16

VENTING INSTALLATION

Installation For Vertical Termination (Cont.)

VENTING INSTALLATION

Continued

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 Fig- ure 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 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 33). Apply a bead of non-hardening mastic around the top edges of the support box to make a seal be- tween the box and the roof. Nail in place with roofing nails. Remove any combustible 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 Installation, page 15.

Level

Cathedral ceiling support box

2" minimum below finished ceiling

Cut hole 1/8" larger than support box when projected onto roofline

Figure 32 - Cathedral Ceiling Support Box Installation

Nonhardening Mastic under all edges of support box before nailing

Figure 33 - Installed Cathedral Ceiling Support Box

Vertical Termination Configurations

Figures 34 and 35 and Figures 36 and 37 on page 17 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 11.

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.

Note: Install restrictor into 4" collar of burner system as shown.

Figure 34 - Vertical Rigid Venting Configuration Using One 90° Elbow

Venting with Two 90° Elbows

Vertical (V) Horizontal (H1) +

Horizontal (H2)

5' min.	2' max.
6' min.	4' max.
7' min.	6' max.
8' min.	8' max.
20' max.	8' max.

Note: Install restrictor into 4" collar of burner system as shown.

Figure 35 - Vertical Rigid Venting Configuration Using Two 90° Elbows with Two Horizontal Runs

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