OWNER’S MANUAL
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 22). 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 23). Apply a bead of
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 finished ceiling
Vertical Termination Configurations
Figures 24 through 27 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.
| Venting with Two 90° Elbows | |
| Vertical (V) | Horizontal (H1) + |
|
| Horizontal (H2) |
| 5' min. | 2' max. |
| 6' min. | 4' max. |
FD60 | 7' min. | 6' max. |
8' min. | 8' max. | |
60˚ Starter/ |
|
|
Adapter Required | 20' max. | 8' max. |
Note: Restrictor must be installed in all vertical installations.
Figure 24 - Vertical Rigid Venting Configuration Using Two 90° Elbows with Two
Horizontal Runs
Cut hole 1/8" larger than support box when projected onto roofline
Figure 22 - Cathedral Ceiling Support Box Installation
FD60
60˚ Starter/
Adapter
Required
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. |
Figure 23 - Installed Cathedral Ceiling Support Box
Figure 25 - Vertical Rigid Venting Configuration Using One 90° Elbow | Continued |
106424 | 13 |
