A.O. Smith FDV Owner's Manual - page 7
7
FIGURE 7
5.
As an aid to leveling the 5 inch elbow, temporarily place the 5
inch sliding tube onto the elbow. When leveled, drill a 1/8
diameter hole through the elbow into the collar at the front and
back. Secure with the two #8 sheet metal screws provided.
See figure 9.
Place the finishing collar on the 5 inch elbow, as it will be
positioned later.
FIGURE 8
6.
Extend the 3 inch tube assembly to its maximum installed
length, 20-3/4 inches. A minimum of 1-1/4" overlap is required
at all 3" vent pipe joints. Place the larger main section through
the hole in the external wall to the outside. Place the inner
sliding section fully onto the 3 inch elbow. Apply high
temperature silicone sealant as shown in fig. 10.
FIGURE 9
7.
Attach the 5 inch main tube to the vent terminal base. Drill a
1/8 inch hole through the tube into the collar of the base. Secure
with a #8 sheet metal screw, furnished. Repeat with a second
hole and screw approximately 180° from the first. Reinstall
the 5 inch inner sliding section at its maximum extended length,
19-3/4 inches. See figure 11.
FIGURE 10
8.
From the outside of the building, insert the 5 inch tube/base
assembly through the hole in the exterior wall and onto the 5
inch elbow. Then seal the base onto the wall. See figure 12.
FIGURE 11
9.
Next place the 3 inch main tube fully onto the collar of the vent
cap. Then seat the cap against the base.
FIGURE 12
10. Secure the vent cap/base assembly to the exterior wall with
four screw anchors appropriate for the type of wall construction.
The 5 inch tube should be essentially level. However, a small
amount of upward or downward pitch will not affect operation.
11. Apply silicone caulking compound around the junction of the
vent terminal base and the exterior wall.
12. Position and fasten the finishing collar, previously installed
on the 5 inch elbow, against the wall to close the opening
around the tube.
13. Make certain the 5 inch tube sliding section has been fully
engaged onto the 5 inch elbow. Drill two each 1/8 inch holes
(180° apart) in the junction of the two joints in the five inch
tube. Fasten with four #8 sheet metal screws, furnished.